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摘要: 【研究目的】由于硅酸盐岩石与土壤的成分不同，开展硅酸盐岩石与土壤中氧化亚铁的对比研究有利于更加准确地滴定氧化亚铁的含量。【研究方法】本文对重铬酸钾滴定法滴定硅酸盐岩石与土壤中氧化亚铁进行了对比，重点比较了溶样时间对氧化亚铁的影响，实验使用硫酸（1+1）和氢氟酸溶样，多余的氟用硼酸络合，以二苯胺磺酸钠为指示剂，重铬酸钾标准溶液滴定氧化亚铁。【研究结果】分析结果表明，溶样时间对硅酸盐岩石和土壤中氧化亚铁影响较大，硅酸盐岩石和土壤样品分别在溶液完全沸腾0～2 min 和8～10 min 时滴定为宜；方法经国家一级标准物质分析验证，结果与参考值相符，硅酸盐岩石和土壤的精密度RSD（n=10）分别为1.94%、1.78%。【结论】因此，在实际操作中应根据样品的类型选择合适的溶样时间，能够更加准确地确定氧化亚铁的含量。Abstract: This paper is the result of titration of ferrous oxide.[Objective] Due to the different compositions of silicate rocks and soil, conducting comparative studies on ferrous oxide in silicate rocks and soil is beneficial for more accurate titration of ferrous oxide.[Methods] This article compared the titration of ferrous oxide in silicate rocks and soil using potassium dichromate titration method, with a focus on the effect of sample dissolution time on ferrous oxide.The sample was dissolved with sulfuric acid (1+1) and hydrofluoric acid, the excess fluorine was complexed with boric acid, and ferrous oxide was titrated with sodium diphenylamine sulfonate as indicator and potassium dichromate standard solution.[Results] The results showed that the dissolution time had great influence on the ferrous oxide in rock and soil, and it was appropriate to titrate the rock and soil samples when the solution was completely boiled for 0~2 min and 8~10 min, respectively.The results were verified by the national standard material analysis, the results agreed with the reference values.The precision RSD(n=10) of rock and soil were 1.94%、1.78% respectively.[Conclusions]Therefore, in practical operation, the appropriate dissolution time should be selected according to the type of sample, in order to more accurately titrate the content of ferrous oxide.
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Key words:
- ferrous oxide /
- silicate rocks /
- soil /
- dissolution time
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[1] 卜道露,张志翔,熊韬,等.2021.碱熔-ICP-OES 和XRF 测定硅酸盐样品中主量元素的比较[J].应用化工,50增刊1:378-385.
[2] 车巨龙.2022.重铬酸钾滴定法测定球团矿中氧化亚铁含量的研究[J].山西冶金,195(1):89-90、95.
[3] 陈丽春.电感耦合等离子体发射光谱法测定石灰岩样品中氧化钾、氧化钠的方法改进[J].福建分析测试,2023,32(6):55-59.
[4] 李婵贞.2022.X 射线荧光光谱法硅酸盐岩石主次成分的测定的探讨及建议[J].四川有色金属,(2):48-51.
[5] 林桂芝.2022.X 射线荧光光谱法测定硅酸盐岩石中主次量成分结果异常时的质量控制[J].理化检验(化学分册),58(2):216-219.
[6] 凌进中.1984.硅酸盐岩石中氧化亚铁的分析方法[J].理化检验(化学分册),4:53-55.
[7] 潘涵香,胡超涌,王红梅,等.2007.邻二氮菲分光光度法测定碳酸盐相中微量亚铁[J].岩矿测试,26(3):198-200.
[8] 秦海娜,尚世超,耿丽婵,等.2023.熔融制片-X射线荧光光谱法测定碳酸盐岩石中主次量元素[J].分析仪器,(3):64-68.
[9] 秦立俊,郑光煜,王通胜,等.2011.硫酸亚铁铵容量法测定铬铁石中氧化亚铁[J].山东化工,(40):46-48.
[10] 帅林阳,卜道露,成俊烨.2021.硅酸盐岩石中氧化亚铁量测定方法的改进[J].辽宁化工,50(7):1102-1105.
[11] 王兢,袁伟哲,王佳丽,等.2015.X 荧光光谱法测定岩石、土壤、水系沉积物中的主次量元素[J].吉林地质,34(4):129-131.
[12] 王娜.2016.超基性岩中氧化亚铁的测定[J].新疆有色金属,39(6):59-60.
[13] 王旭刚,孙丽蓉,张颖蕾,等.2018.豫西旱作褐土剖面土壤的氧化铁还原与亚铁氧化特征[J].土壤学报[J].55(5):1199-1211.
[14] 《岩石矿物分析》编委会.2011.岩石矿物分析(第四版第二分册)[M].北京:地质出版社.
[15] 姚成虎.2021.重铬酸钾滴定法测定金属化球团中氧化亚铁含量[J].安徽冶金科技职业学院学报,31(1):9-11.
[16] 张珂,马明,马龙,等.2018.电位滴定法测定铁矿石中氧化亚铁[J].冶金分析,38(5):66-71.
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