High-precision analysis of Pb isotope ratios using MC-ICP-MS and the Pb isotope compositions of rock standard samples
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摘要:
利用多接收电感耦合等离子体质谱仪(Neptune plus)建立了高精度铅同位素比值MC-ICP-MS测试方法。建立该方法的过程中,重点评估了加入的Tl标准溶液对铅同位素比值测试结果的影响,并最终确定Tl标准溶液的浓度为25 ng/mL,同时样品溶液Pb的浓度应该大于25 ng/mL(即Pb/Tl浓度比应大于1)。利用该方法对铅同位素标准物质SRM 981进行了长期监控(2020年7月—2021年6月),测试结果为:206Pb/204Pb=16.9415±0.0010、207Pb/204Pb=15.4985±0.0009、208Pb/204Pb=36.7204±0.0023,与统计的文献报道值一致。长期监控的全流程空白均小于0.25 ng,能满足地质样品高精度铅同位素比值测试的需要。同时运用该方法,对4个元素含量标样(BCR-2、AGV-2、BHVO-2和BIR-1a)进行了铅同位素比值测试,测试结果与文献报道的测试结果和精度一致,表明建立的方法是准确、可靠的。
Abstract:A method for high-precision analysis of Pb isotope using MC-ICP-MS(Neptune plus) was established in Wuhan Centre, China Geological Survey.This study has focused on the influence of Tl standard solution of various concentration on the test results of Pb isotope ratio, and the optimal concentration of Tl standard solution has been determined to be 25 ng/mL, and the Pb concentration in the sample solution should be higher than 25 ng/mL(i.e.the Pb/Tl concentration ratio should be higher than 1).The Pb isotope reference material SRM 981 has been tested with this method for 11 months(July 2020~June 2021).The isotope ratios for SRM 981 are 206Pb/204Pb=16.9415±0.0010, 207Pb/204Pb=15.4985±0.0009 and 208Pb/204Pb=36.7204±0.0023, which are identical to the published data.The blank of long-term monitoring is less than 0.25 ng, which can meet the needs of high-precision lead isotope ratio test of geological samples.Meanwhile, we determined the Pb isotope composition of four trace element standard samples(BCR-2、AGV-2、BHVO-2 and BIR-1a) by using the same procedure.The results are consistent with the published data, hence this method is accurate and reliable.
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Key words:
- Pb isotope /
- MC-ICP-MS /
- USGS reference materials /
- rock standard samples
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表 1 样品的化学分离流程
Table 1. Chemical procedure for lead separation
步骤 用量 备注 6 mol/L HCl和超纯水交替淋洗 每次各10 mL,3次 清洗树脂 1mol/L HBr+2 mol/L HCl 2 mL 平衡树脂 1mol/L HBr+2 mol/L HCl 4 mL 上样 0.3 mol/L HBr 8 mL,2次 淋洗杂质 0.5 mol/L HCl 3mL 转换体系 6 mol/L HCl 7 mL 解吸Pb 表 2 MC-ICP-MS的仪器参数设置
Table 2. MC-ICP-MS operation conditions
名称 具体描述 仪器型号 Thermo Fisher Scientific,Neptune plus 高频发生器功率 约1200 W 冷却气 16 L/min 辅助气 0.8 L/min 样品气 约1 L/min 分辨率 低分辨 锥 Ni锥(标准采样锥+H截取锥) 接收器 法拉第杯;L3(202Hg),L2(203Tl),L1(204Pb),C(205Tl),H1(206Pb),H2(207Pb),H3(208Pb) 灵敏度 208Pb: 10~12 V(Pb标准溶液的浓度为200 ng/mL) 表 3 标准物质SRM 981(不同浓度Tl标准溶液及不同Pb/Tl值)铅同位素比值测试结果
Table 3. Pb isotope ratios of SRM 981 with different concentrations of Tl standard solution and Pb/Tl ratio
Tl/(ng·mL-1) Pb/(ng·mL-1) Pb/Tl 206Pb/204Pb 2σ 207Pb/204Pb 2σ 208Pb/204Pb 2σ 15 300 20 16.9418 0.0002 15.4992 0.0003 36.7229 0.0008 30 300 10 16.9416 0.0002 15.4991 0.0005 36.7227 0.0010 60 300 5 16.9408 0.0003 15.4984 0.0003 36.7208 0.0010 150 300 2 16.9398 0.0002 15.4976 0.0002 36.7190 0.0006 300 300 1 16.9379 0.0003 15.4958 0.0003 36.7146 0.0006 10 200 20 16.9410 0.0003 15.4988 0.0003 36.7210 0.0012 20 200 10 16.9417 0.0005 15.4990 0.0004 36.7221 0.0011 40 200 5 16.9406 0.0003 15.4981 0.0002 36.7196 0.0010 100 200 2 16.9405 0.0004 15.4981 0.0005 36.7204 0.0010 200 200 1 16.9400 0.0005 15.4977 0.0004 36.7192 0.0011 400 200 0.5 16.9341 0.0005 15.4918 0.0005 36.7054 0.0012 5 100 20 16.9427 0.0006 15.5006 0.0006 36.7261 0.0019 10 100 10 16.9414 0.0007 15.4993 0.0007 36.7217 0.0010 20 100 5 16.9412 0.0002 15.4991 0.0003 36.7218 0.0006 50 100 2 16.9404 0.0005 15.4979 0.0004 36.7206 0.0008 100 100 1 16.9386 0.0009 15.4963 0.0007 36.7160 0.0016 200 100 0.5 16.9337 0.0008 15.4915 0.0006 36.7050 0.0017 500 100 0.2 16.9204 0.0016 15.4789 0.0015 36.6751 0.0035 2.5 50 20 16.9419 0.0010 15.4996 0.0015 36.7242 0.0046 5 50 10 16.9425 0.0006 15.5003 0.0006 36.7269 0.0014 10 50 5 16.9416 0.0005 15.4993 0.0005 36.7229 0.0017 25 50 2 16.9405 0.0006 15.4980 0.0006 36.7191 0.0014 50 50 1 16.9386 0.0008 15.4962 0.0007 36.7155 0.0016 100 50 0.5 16.9351 0.0008 15.4930 0.0007 36.7075 0.0020 250 50 0.2 16.9231 0.0015 15.4816 0.0016 36.6813 0.0033 500 50 0.1 16.9012 0.0029 15.4614 0.0027 36.6330 0.0060 1 20 20 16.9417 0.0033 15.5003 0.0035 36.7267 0.0098 2 20 10 16.9428 0.0024 15.5009 0.0023 36.7263 0.0071 4 20 5 16.9422 0.0030 15.4998 0.0030 36.7245 0.0079 10 20 2 16.9376 0.0011 15.4950 0.0011 36.7139 0.0030 20 20 1 16.9371 0.0025 15.4949 0.0024 36.7122 0.0056 40 20 0.5 16.9341 0.0032 15.4923 0.0028 36.7048 0.0067 100 20 0.2 16.9233 0.0035 15.4813 0.0035 36.6816 0.0084 200 20 0.1 16.9028 0.0035 15.4630 0.0029 36.6369 0.0073 0.5 10 20 16.9357 0.0014 15.4980 0.0047 36.7209 0.0137 1 10 10 16.9434 0.0049 15.5034 0.0048 36.7363 0.0128 2 10 5 16.9374 0.0021 15.4970 0.0022 36.7164 0.0067 5 10 2 16.9394 0.0005 15.4957 0.0010 36.7185 0.0011 10 10 1 16.9329 0.0045 15.4906 0.0045 36.7033 0.0113 20 10 0.5 16.9354 0.0008 15.4943 0.0008 36.7112 0.0023 50 10 0.2 16.9214 0.0037 15.4793 0.0032 36.6783 0.0087 100 10 0.1 16.9108 0.0049 15.4694 0.0046 36.6518 0.0099 0.25 5 20 16.9370 0.0089 15.4921 0.0087 36.7070 0.0234 0.5 5 10 16.9544 0.0105 15.5105 0.0108 36.7508 0.0286 1 5 5 16.9376 0.0052 15.4940 0.0049 36.7079 0.0118 2.5 5 2 16.9410 0.0060 15.4976 0.0059 36.7197 0.0125 5 5 1 16.9408 0.0048 15.4966 0.0040 36.7155 0.0093 10 5 0.5 16.9340 0.0100 15.4913 0.0094 36.7043 0.0222 25 5 0.2 16.9211 0.0038 15.4786 0.0032 36.6769 0.0074 50 5 0.1 16.9150 0.0069 15.4737 0.0068 36.6591 0.0162 Tl/(ng·mL-1) Pb/(ng·mL-1) Pb/Tl 208Pb/206Pb 2σ 207Pb/206Pb 2σ 204Pb/206Pb 2σ 15 300 20 2.16757 0.00003 0.914848 0.000008 0.059025 0.000001 30 300 10 2.16762 0.00002 0.914873 0.000004 0.059026 0.000001 60 300 5 2.16758 0.00003 0.914858 0.000003 0.059029 0.000001 150 300 2 2.16760 0.00002 0.914865 0.000007 0.059032 0.000001 300 300 1 2.16760 0.00002 0.914861 0.000001 0.059039 0.000001 10 200 20 2.16754 0.00005 0.914855 0.000005 0.059028 0.000001 20 200 10 2.16756 0.00002 0.914852 0.000007 0.059026 0.000002 40 200 5 2.16753 0.00002 0.914849 0.000007 0.059030 0.000001 100 200 2 2.16761 0.00002 0.914858 0.000007 0.059030 0.000002 200 200 1 2.16761 0.00002 0.914860 0.000005 0.059032 0.000002 400 200 0.5 2.16757 0.00002 0.914847 0.000004 0.059052 0.000002 5 100 20 2.16757 0.00001 0.914860 0.000008 0.059023 0.000002 10 100 10 2.16763 0.00006 0.914854 0.000015 0.059027 0.000003 20 100 5 2.16761 0.00003 0.914866 0.000007 0.059028 0.000001 50 100 2 2.16763 0.00005 0.914863 0.000009 0.059031 0.000002 100 100 1 2.16763 0.00002 0.914855 0.000007 0.059037 0.000003 200 100 0.5 2.16758 0.00002 0.914843 0.000006 0.059054 0.000003 500 100 0.2 2.16751 0.00001 0.914824 0.000009 0.059100 0.000006 2.5 50 20 2.16751 0.00009 0.914837 0.000017 0.059025 0.000004 5 50 10 2.16773 0.00002 0.914875 0.000005 0.059023 0.000002 10 50 5 2.16759 0.00004 0.914876 0.000010 0.059026 0.000002 25 50 2 2.16757 0.00004 0.914841 0.000010 0.059030 0.000002 50 50 1 2.16759 0.00003 0.914856 0.000013 0.059037 0.000003 100 50 0.5 2.16758 0.00003 0.914850 0.000009 0.059049 0.000003 250 50 0.2 2.16752 0.00001 0.914827 0.000009 0.059091 0.000005 500 50 0.1 2.16745 0.00002 0.914795 0.000016 0.059167 0.000010 1 20 20 2.16779 0.00016 0.914909 0.000035 0.059026 0.000011 2 20 10 2.16763 0.00012 0.914871 0.000037 0.059022 0.000008 4 20 5 2.16766 0.00008 0.914857 0.000016 0.059024 0.000010 10 20 2 2.16764 0.00006 0.914846 0.000019 0.059040 0.000004 20 20 1 2.16758 0.00004 0.914873 0.000026 0.059042 0.000009 40 20 0.5 2.16757 0.00002 0.914851 0.000021 0.059053 0.000011 100 20 0.2 2.16751 0.00002 0.914806 0.000013 0.059090 0.000012 200 20 0.1 2.16745 0.00003 0.914794 0.000016 0.059162 0.000012 0.5 10 20 2.16756 0.00034 0.914829 0.000087 0.059047 0.000005 1 10 10 2.16792 0.00022 0.914894 0.000047 0.059020 0.000017 2 10 5 2.16789 0.00015 0.914916 0.000035 0.059041 0.000007 5 10 2 2.16757 0.00007 0.914849 0.000020 0.059034 0.000002 10 10 1 2.16757 0.00007 0.914904 0.000024 0.059057 0.000016 20 10 0.5 2.16758 0.00002 0.914892 0.000023 0.059048 0.000003 50 10 0.2 2.16755 0.00006 0.914799 0.000029 0.059097 0.000013 100 10 0.1 2.16746 0.00004 0.914762 0.000019 0.059134 0.000017 0.25 5 20 2.16709 0.00081 0.914668 0.000179 0.059043 0.000031 0.5 5 10 2.16775 0.00037 0.914836 0.000097 0.058982 0.000037 1 5 5 2.16724 0.00023 0.914781 0.000053 0.059041 0.000018 2.5 5 2 2.16755 0.00015 0.914834 0.000045 0.059029 0.000021 5 5 1 2.16746 0.00008 0.914793 0.000019 0.059029 0.000017 10 5 0.5 2.16749 0.00009 0.914806 0.000042 0.059053 0.000035 25 5 0.2 2.16731 0.00003 0.914729 0.000039 0.059098 0.000013 50 5 0.1 2.16729 0.00005 0.914801 0.000051 0.059120 0.000024 表 4 不同实验室标准物质SRM 981铅同位素比值测试结果比对
Table 4. Comparison of Pb isotope ratios of SRM 981 with different methods in different laboratories
数据来源 测试方法 测试仪器 206Pb/204Pb 2σ 207Pb/204Pb 2σ 208Pb/204Pb 2σ 207Pb/206Pb 2σ 208Pb/206Pb 2σ 推荐值 16.9371 15.4913 36.7213 0.91464 0.00033 2.1681 0.0008 何学贤等,2005 Tl内标 MC-ICP-MS 16.9402 0.0007 15.4966 0.0030 36.7155 0.0012 0.91478 0.00018 2.1674 0.0004 Taylor et al., 2015 长期统计结果 16.9412 15.4988 36.7233 Yuan et al., 2016 长期统计结果 16.9406 0.0003 15.4957 0.0002 36.7184 0.0007 Galer et al., 1998 三稀释剂 TIMS 16.9405 0.0015 15.4963 0.0016 36.7219 0.0044 0.91475 0.00004 2.16771 0.00010 Thirlwall, 2002 双稀释剂 TIMS 16.9408 0.0021 15.4980 0.0025 36.7220 0.0080 0.91483 0.00007 2.16767 0.00041 Thirlwall, 2002 双稀释剂 MC-ICP-MS 16.9417 0.0029 15.4996 0.0031 36.7240 0.0080 0.91488 0.00008 2.16770 0.00024 Kuritani et al., 2003 双稀释剂 TIMS 16.9414 0.0028 15.4992 0.0029 36.7230 0.0075 0.91487 0.00005 2.16765 0.00018 Bake et al., 2004 双稀释剂 MC-ICP-MS 16.9416 0.0013 15.5000 0.0015 36.7262 0.0031 0.91491 0.00004 2.16781 0.00012 Amelin et al., 2006 双稀释剂 TIMS 16.9408 0.0012 15.4987 0.0011 36.7278 0.0029 0.91483 0.00005 2.16741 0.00016 Makishima et al., 2007 双稀释剂 MC-ICP-MS 16.9417 0.0024 15.4988 0.0025 36.7196 0.0066 0.91483 0.00005 2.16741 0.00016 Makishima et al., 2010 双稀释剂 MC-ICP-MS 16.9415 0.0030 15.4991 0.0034 36.7233 0.0077 0.91486 0.00005 2.16766 0.00019 Hoernle et al., 2011 双稀释剂 TIMS 16.9416 0.0024 15.4998 0.0024 36.7231 0.0063 0.91490 0.00005 2.16763 0.00019 刘希君等, 2013 双稀释剂 TIMS 16.9408 0.0034 15.4953 0.0046 36.7178 0.0100 本文 Tl内标 MC-ICP-MS 16.9415 0.0010 15.4985 0.0009 36.7204 0.0023 0.914829 0.000023 2.16749 0.00008 测试平均值 16.9411 0.0010 15.4981 0.0032 36.7220 0.0068 0.914844 0.000102 2.16761 0.00029 表 5 2020年7月—2021年6月标准物质SRM 981铅同位素比值测试结果
Table 5. Pb isotope ratios of reference material SRM 981 from July 2020 to June 2021
序号 206Pb/204Pb 2σ 207Pb/204Pb 2σ 208Pb/204Pb 2σ 208Pb/206Pb 2σ 207Pb/206Pb 2σ 1 16.9406 0.0005 15.4979 0.0004 36.7192 0.0015 2.16752 0.00003 0.914839 0.000007 2 16.9405 0.0002 15.4979 0.0003 36.7191 0.0010 2.16753 0.00002 0.914841 0.000009 3 16.9412 0.0004 15.4985 0.0004 36.7207 0.0011 2.16755 0.00002 0.914847 0.000006 4 16.9415 0.0002 15.4990 0.0002 36.7226 0.0007 2.16760 0.00002 0.914852 0.000007 5 16.9411 0.0004 15.4985 0.0004 36.7210 0.0011 2.16754 0.00002 0.914831 0.000005 6 16.9406 0.0002 15.4979 0.0003 36.7197 0.0007 2.16755 0.00002 0.914844 0.000005 7 16.9402 0.0004 15.4974 0.0004 36.7175 0.0013 2.16750 0.00003 0.914836 0.000007 8 16.9413 0.0002 15.4987 0.0002 36.7215 0.0005 2.16758 0.00002 0.914849 0.000008 9 16.9415 0.0003 15.4987 0.0003 36.7213 0.0008 2.16752 0.00003 0.914829 0.000006 10 16.9412 0.0004 15.4984 0.0003 36.7200 0.0009 2.16747 0.00001 0.914832 0.000004 11 16.9412 0.0004 15.4982 0.0003 36.7195 0.0009 2.16747 0.00001 0.914825 0.000007 12 16.9409 0.0002 15.4979 0.0002 36.7181 0.0007 2.16746 0.00003 0.914824 0.000005 13 16.9408 0.0003 15.4977 0.0002 36.7187 0.0006 2.16747 0.00001 0.914818 0.000007 14 16.9407 0.0004 15.4980 0.0003 36.7188 0.0009 2.16749 0.00003 0.914834 0.000007 15 16.9411 0.0003 15.4983 0.0003 36.7196 0.0006 2.16749 0.00002 0.914829 0.000004 16 16.9420 0.0004 15.4992 0.0004 36.7221 0.0011 2.16752 0.00003 0.914842 0.000006 17 16.9422 0.0004 15.4993 0.0003 36.7220 0.0006 2.16751 0.00002 0.914841 0.000008 18 16.9419 0.0004 15.4991 0.0003 36.7218 0.0010 2.16750 0.00002 0.914831 0.000009 19 16.9423 0.0002 15.4992 0.0003 36.7222 0.0009 2.16749 0.00002 0.914839 0.000003 20 16.9410 0.0004 15.4982 0.0004 36.7195 0.0009 2.16751 0.00002 0.914834 0.000006 21 16.9419 0.0004 15.4985 0.0003 36.7213 0.0011 2.16745 0.00004 0.914814 0.000013 22 16.9423 0.0001 15.4992 0.0003 36.7214 0.0008 2.16749 0.00002 0.914839 0.000004 23 16.9412 0.0002 15.4984 0.0002 36.7200 0.0007 2.16749 0.00002 0.914834 0.000003 24 16.9409 0.0005 15.4980 0.0005 36.7189 0.0013 2.16747 0.00002 0.914828 0.000004 25 16.9408 0.0003 15.4979 0.0003 36.7186 0.0006 2.16750 0.00002 0.914830 0.000006 26 16.9410 0.0003 15.4982 0.0004 36.7194 0.0011 2.16752 0.00002 0.914836 0.000010 27 16.9409 0.0004 15.4980 0.0004 36.7191 0.0008 2.16747 0.00001 0.914826 0.000006 28 16.9406 0.0003 15.4979 0.0003 36.7188 0.0008 2.16750 0.00003 0.914829 0.000005 29 16.9408 0.0002 15.4980 0.0002 36.7193 0.0004 2.16749 0.00001 0.914836 0.000003 30 16.9415 0.0005 15.4987 0.0004 36.7204 0.0006 2.16753 0.00001 0.914844 0.000005 31 16.9419 0.0002 15.4991 0.0002 36.7221 0.0007 2.16751 0.00001 0.914836 0.000005 32 16.9420 0.0005 15.4985 0.0002 36.7200 0.0006 2.16747 0.00001 0.914830 0.000007 33 16.9419 0.0005 15.4993 0.0005 36.7223 0.0013 2.16755 0.00002 0.914849 0.000005 34 16.9419 0.0003 15.4991 0.0003 36.7217 0.0010 2.16751 0.00002 0.914839 0.000006 35 16.9417 0.0003 15.4990 0.0003 36.7218 0.0006 2.16755 0.00002 0.914848 0.000006 36 16.9415 0.0003 15.4991 0.0002 36.7217 0.0006 2.16753 0.00001 0.914854 0.000003 37 16.9417 0.0004 15.4989 0.0003 36.7213 0.0009 2.16752 0.00002 0.914839 0.000004 38 16.9414 0.0003 15.4986 0.0003 36.7204 0.0008 2.16748 0.00002 0.914838 0.000009 39 16.9418 0.0003 15.4990 0.0003 36.7213 0.0007 2.16749 0.00002 0.914832 0.000005 40 16.9418 0.0004 15.4989 0.0005 36.7216 0.0012 2.16752 0.00002 0.914834 0.000005 41 16.9424 0.0003 15.4997 0.0002 36.7232 0.0005 2.16752 0.00001 0.914851 0.000004 42 16.9417 0.0003 15.4988 0.0004 36.7214 0.0009 2.16751 0.00003 0.914833 0.000007 43 16.9417 0.0003 15.4987 0.0003 36.7203 0.0007 2.16745 0.00002 0.914826 0.000003 44 16.9421 0.0004 15.4991 0.0004 36.7212 0.0013 2.16747 0.00004 0.914821 0.000008 45 16.9424 0.0004 15.4993 0.0004 36.7225 0.0011 2.16749 0.00002 0.914821 0.000009 46 16.9420 0.0004 15.4987 0.0004 36.7209 0.0012 2.16747 0.00002 0.914826 0.000006 47 16.9424 0.0004 15.4990 0.0003 36.7218 0.0009 2.16748 0.00002 0.914814 0.000005 48 16.9419 0.0003 15.4987 0.0003 36.7210 0.0008 2.16749 0.00002 0.914814 0.000008 49 16.9422 0.0004 15.4992 0.0004 36.7223 0.0009 2.16750 0.00002 0.914823 0.000007 50 16.9416 0.0001 15.4985 0.0002 36.7213 0.0003 2.16750 0.00002 0.914825 0.000004 51 16.9419 0.0004 15.4989 0.0005 36.7220 0.0011 2.16754 0.00002 0.914829 0.000007 52 16.9421 0.0003 15.4992 0.0003 36.7224 0.0009 2.16752 0.00003 0.914828 0.000009 53 16.9419 0.0004 15.4989 0.0005 36.7215 0.0009 2.16749 0.00002 0.914832 0.000009 54 16.9413 0.0004 15.4984 0.0004 36.7196 0.0010 2.16746 0.00002 0.914825 0.000006 55 16.9411 0.0002 15.4981 0.0001 36.7189 0.0006 2.16744 0.00001 0.914822 0.000006 56 16.9414 0.0006 15.4981 0.0004 36.7192 0.0012 2.16742 0.00002 0.914815 0.000003 57 16.9414 0.0003 15.4983 0.0004 36.7189 0.0011 2.16744 0.00002 0.914826 0.000007 58 16.9412 0.0003 15.4985 0.0002 36.7214 0.0008 2.16759 0.00001 0.914841 0.000005 59 16.9412 0.0003 15.4983 0.0003 36.7204 0.0010 2.16754 0.00003 0.914831 0.000009 60 16.9415 0.0002 15.4989 0.0003 36.7212 0.0008 2.16751 0.00003 0.914848 0.000006 61 16.9416 0.0004 15.4986 0.0004 36.7203 0.0009 2.16746 0.00001 0.914828 0.000008 62 16.9410 0.0003 15.4982 0.0004 36.7198 0.0011 2.16753 0.00002 0.914836 0.000002 63 16.9417 0.0002 15.4988 0.0002 36.7218 0.0005 2.16753 0.00003 0.914836 0.000010 64 16.9416 0.0003 15.4989 0.0003 36.7215 0.0005 2.16752 0.00001 0.914845 0.000004 65 16.9411 0.0003 15.4985 0.0003 36.7212 0.0006 2.16757 0.00002 0.914841 0.000007 66 16.9416 0.0003 15.4987 0.0003 36.7210 0.0008 2.16751 0.00002 0.914835 0.000007 67 16.9414 0.0003 15.4987 0.0003 36.7207 0.0007 2.16749 0.00001 0.914829 0.000004 68 16.9414 0.0003 15.4984 0.0003 36.7195 0.0010 2.16749 0.00003 0.914835 0.000010 69 16.9410 0.0001 15.4981 0.0002 36.7203 0.0002 2.16749 0.00002 0.914819 0.000004 70 16.9412 0.0007 15.4980 0.0004 36.7195 0.0011 2.16748 0.00002 0.914838 0.000006 71 16.9418 0.0005 15.4987 0.0004 36.7202 0.0010 2.16749 0.00002 0.914827 0.000010 72 16.9413 0.0004 15.4985 0.0004 36.7209 0.0011 2.16752 0.00002 0.914840 0.000007 73 16.9409 0.0002 15.4982 0.0002 36.7192 0.0006 2.16747 0.00001 0.914839 0.000004 74 16.9408 0.0001 15.4981 0.0002 36.7187 0.0007 2.16744 0.00002 0.914824 0.000005 75 16.9420 0.0004 15.4990 0.0004 36.7209 0.0012 2.16745 0.00002 0.914823 0.000005 76 16.9411 0.0003 15.4982 0.0002 36.7188 0.0007 2.16742 0.00002 0.914820 0.000007 77 16.9418 0.0005 15.4989 0.0004 36.7206 0.0009 2.16745 0.00004 0.914829 0.000010 78 16.9411 0.0002 15.4982 0.0003 36.7187 0.0008 2.16742 0.00002 0.914834 0.000006 79 16.9424 0.0004 15.4992 0.0003 36.7219 0.0008 2.16745 0.00002 0.914819 0.000014 80 16.9422 0.0002 15.4989 0.0003 36.7211 0.0007 2.16742 0.00003 0.914812 0.000013 81 16.9416 0.0002 15.4983 0.0002 36.7202 0.0005 2.16744 0.00003 0.914797 0.000008 82 16.9422 0.0004 15.4991 0.0004 36.7210 0.0011 2.16743 0.00002 0.914822 0.000006 83 16.9421 0.0002 15.4989 0.0002 36.7207 0.0007 2.16743 0.00002 0.914823 0.000003 84 16.9419 0.0004 15.4985 0.0003 36.7197 0.0009 2.16738 0.00002 0.914803 0.000005 85 16.9413 0.0002 15.4979 0.0002 36.7188 0.0006 2.16740 0.00003 0.914802 0.000007 86 16.9420 0.0002 15.4987 0.0002 36.7207 0.0006 2.16744 0.00002 0.914808 0.000009 87 16.9414 0.0007 15.4980 0.0004 36.7193 0.0014 2.16743 0.00003 0.914815 0.000011 88 16.9418 0.0004 15.4986 0.0003 36.7207 0.0010 2.16743 0.00002 0.914813 0.000008 89 16.9411 0.0003 15.4982 0.0003 36.7193 0.0005 2.16745 0.00001 0.914825 0.000007 90 16.9418 0.0003 15.4986 0.0003 36.7201 0.0008 2.16744 0.00002 0.914817 0.000007 91 16.9415 0.0003 15.4983 0.0002 36.7200 0.0009 2.16747 0.00003 0.914837 0.000006 92 16.9422 0.0002 15.4991 0.0002 36.7211 0.0008 2.16741 0.00002 0.914815 0.000004 93 16.9421 0.0002 15.4986 0.0002 36.7206 0.0002 2.16743 0.00001 0.914800 0.000003 94 16.9424 0.0004 15.4988 0.0003 36.7214 0.0011 2.16746 0.00002 0.914804 0.000005 95 16.9413 0.0005 15.4983 0.0004 36.7194 0.0011 2.16745 0.00003 0.914822 0.000006 96 16.9413 0.0003 15.4984 0.0001 36.7190 0.0006 2.16744 0.00001 0.914824 0.000002 97 16.9414 0.0004 15.4985 0.0003 36.7198 0.0009 2.16748 0.00002 0.914833 0.000009 98 16.9413 0.0003 15.4981 0.0003 36.7193 0.0009 2.16745 0.00002 0.914817 0.000006 99 16.9418 0.0004 15.4987 0.0003 36.7209 0.0007 2.16749 0.00002 0.914817 0.000004 100 16.9420 0.0003 15.4990 0.0004 36.7218 0.0010 2.16754 0.00002 0.914837 0.000007 101 16.9415 0.0002 15.4984 0.0002 36.7202 0.0005 2.16746 0.00001 0.914829 0.000004 102 16.9416 0.0003 15.4986 0.0003 36.7206 0.0009 2.16749 0.00001 0.914825 0.000005 103 16.9417 0.0003 15.4987 0.0003 36.7211 0.0008 2.16746 0.00001 0.914818 0.000005 104 16.9412 0.0004 15.4980 0.0004 36.7195 0.0013 2.16749 0.00003 0.914828 0.000007 105 16.9414 0.0002 15.4986 0.0003 36.7196 0.0003 2.16749 0.00002 0.914828 0.000007 106 16.9412 0.0003 15.4980 0.0004 36.7189 0.0009 2.16743 0.00002 0.914811 0.000005 107 16.9414 0.0003 15.4984 0.0001 36.7201 0.0001 2.16744 0.00002 0.914810 0.000003 108 16.9413 0.0005 15.4980 0.0004 36.7191 0.0012 2.16742 0.00001 0.914816 0.000007 109 16.9409 0.0002 15.4977 0.0002 36.7188 0.0006 2.16747 0.00002 0.914817 0.000004 110 16.9406 0.0002 15.4982 0.0001 36.7196 0.0006 2.16756 0.00003 0.914849 0.000006 111 16.9414 0.0003 15.4984 0.0003 36.7204 0.0009 2.16750 0.00001 0.914837 0.000004 112 16.9411 0.0001 15.4981 0.0002 36.7193 0.0006 2.16749 0.00002 0.914832 0.000006 113 16.9410 0.0003 15.4984 0.0002 36.7202 0.0009 2.16753 0.00004 0.914843 0.000008 114 16.9408 0.0003 15.4982 0.0003 36.7196 0.0008 2.16753 0.00001 0.914838 0.000004 115 16.9411 0.0002 15.4984 0.0003 36.7205 0.0010 2.16752 0.00003 0.914839 0.000007 116 16.9407 0.0003 15.4981 0.0003 36.7197 0.0009 2.16752 0.00002 0.914832 0.000003 117 16.9410 0.0005 15.4983 0.0005 36.7195 0.0013 2.16750 0.00002 0.914843 0.000005 118 16.9406 0.0005 15.4981 0.0005 36.7189 0.0011 2.16749 0.00001 0.914832 0.000005 119 16.9416 0.0004 15.4988 0.0004 36.7202 0.0013 2.16747 0.00003 0.914836 0.000005 120 16.9414 0.0003 15.4988 0.0004 36.7202 0.0009 2.16748 0.00003 0.914838 0.000007 121 16.9411 0.0004 15.4984 0.0005 36.7198 0.0012 2.16748 0.00002 0.914838 0.000008 平均值 16.9415 0.0010 15.4985 0.0009 36.7204 0.0023 2.16749 0.00008 0.914829 0.000023 表 6 2020年7月—2021年11月全流程空白的测试结果
Table 6. Blank results from July 2020 to November 2021
序号 稀释剂称重/g 208Pb/206Pb 全流程空白/ng 1 0.01951 1025 0.16 2 0.01950 1049 0.12 3 0.01894 1038 0.13 4 0.01772 1049 0.18 5 0.01825 957 0.25 6 0.01831 982 0.21 7 0.01757 971 0.22 8 0.01545 948 0.22 9 0.01917 1042 0.13 10 0.01816 955 0.25 11 0.01865 1034 0.13 表 7 元素含量标样BCR-2铅同位素比值测试结果及比对
Table 7. Comparison of Pb isotope ratios of BCR-2 in different laboratories
数据来源 测试方法 测试仪器 206Pb/204Pb 2σ 207Pb/204Pb 2σ 208Pb/204Pb 2σ 测试次数 Woodhead et al., 2000 双稀释剂 TIMS 18.750 0.011 15.615 0.003 38.691 0.021 4 Collerson et al., 2002 Tl内标 MC-ICP-MS 18.765 0.011 15.628 0.005 38.752 0.022 3 Li et al., 2003 Tl内标 MC-ICP-MS 18.757 0.012 15.624 0.009 38.723 0.018 11 Bake et al., 2004 双稀释剂 MC-ICP-MS 18.760 0.010 15.621 0.008 38.731 0.028 8 Weis et al., 2006 Tl内标 MC-ICP-MS 18.7529 0.0195 15.6249 0.0040 38.7237 0.0405 11 刘希君等, 2013 双稀释剂 TIMS 18.752 0.011 15.619 0.005 38.723 0.020 \ 李世珍等, 2015 Tl内标 MC-ICP-MS 18.7574 0.0053 15.6234 0.0035 38.7305 0.0125 \ 测试平均值 18.757 0.009 15.624 0.006 38.725 0.025 本文 Tl内标 MC-ICP-MS 18.7618 0.0060 15.6270 0.0014 38.7383 0.0110 18 表 8 元素含量标样AGV-2铅同位素比值测试结果及比对
Table 8. Comparison of Pb isotope ratios of AGV-2 in different laboratories
数据来源 测试方法 测试仪器 206Pb/204Pb 2σ 207Pb/204Pb 2σ 208Pb/204Pb 2σ 测试次数 Woodhead et al., 2000 双稀释剂 TIMS 18.864 0.007 15.609 0.006 38.511 0.020 4 Li et al., 2003 Tl内标 MC-ICP-MS 18.879 0.011 15.618 0.008 38.547 0.017 2 Bake et al., 2004 双稀释剂 MC-ICP-MS 18.873 0.005 15.621 0.003 38.552 0.010 5 Weis et al., 2006 Tl内标 MC-ICP-MS 18.8688 0.0063 15.6173 0.0071 38.5443 0.0135 7 刘希君等, 2013 双稀释剂 TIMS 18.870 0.006 15.619 0.003 38.546 0.012 \ 李世珍等, 2015 Tl内标 MC-ICP-MS 18.866 0.001 15.621 0.001 38.530 0.002 \ 测试平均值 18.870 0.011 15.618 0.009 38.538 0.031 本文 Tl内标 MC-ICP-MS 18.8725 0.0050 15.6201 0.0012 38.5445 0.0045 14 表 9 元素含量标样BHVO-2铅同位素比值测试结果及比对
Table 9. Comparison of Pb isotope ratios of BHVO-2 in different laboratories
数据来源 测试方法 测试仪器 206Pb/204Pb 2σ 207Pb/204Pb 2σ 208Pb/204Pb 2σ 测试次数 Woodhead et al., 2000 双稀释剂 TIMS 18.640 0.010 15.538 0.009 38.228 0.026 4 Collerson et al., 2002 Tl内标 MC-ICP-MS 18.679 0.002 15.562 0.002 38.285 0.004 2 Li et al., 2003 Tl内标 MC-ICP-MS 18.687 0.024 15.558 0.019 38.294 0.060 4 Bake et al., 2004 双稀释剂 MC-ICP-MS 18.649 0.019 15.540 0.015 38.249 0.022 5 Weis et al., 2006 Tl内标 MC-ICP-MS 18.6474 0.0242 15.5334 0.0094 38.2367 0.0182 5 测试平均值 18.660 0.042 15.546 0.026 38.259 0.059 本文 Tl内标 MC-ICP-MS 18.6470 0.0078 15.5420 0.0087 38.2522 0.0143 3 表 10 元素含量标样BIR-1a铅同位素比值测试结果及比对
Table 10. Comparison of Pb isotope ratios of BIR-1a in different laboratories
数据来源 测试方法 测试仪器 206Pb/204Pb 2σ 207Pb/204Pb 2σ 208Pb/204Pb 2σ 测试次数 Li et al., 2003 Tl内标 MC-ICP-MS 18.8471 0.0004 15.6407 0.0012 38.4493 0.0022 3 Bake et al., 2004 双稀释剂 MC-ICP-MS 18.851 0.005 15.662 0.001 38.501 0.006 3 测试平均值 18.849 0.006 15.651 0.030 38.475 0.073 本文 Tl内标 MC-ICP-MS 18.8511 0.0084 15.6597 0.0011 38.4918 0.0075 4 -
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