邻菲啰啉助溶保护-容量法测定电气石中的氧化亚铁
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摘要
电气石是一种含硼的铝硅酸盐矿物,是成岩成矿作用的灵敏示踪剂,通过测试围岩电气石中氧化亚铁的含量,可以鉴定电气石所赋存岩床的成因。但是,国内外目前尚无系统的电气石化学成分标准分析方法及电气石化学成分标准物质,针对电气石中氧化亚铁分析方法的研究更是罕有报道。该文通过在溶矿过程中加入邻菲啰啉,与亚铁形成络合物,对亚铁能够起到较好的助溶和保护效果,建立了在聚四氟乙烯坩埚中加入邻菲啰啉、氢氟酸及硫酸,中高温电热板加热溶矿,重铬酸钾容量法测定电气石中的亚铁的方法。该方法的精密度(RSD,n=12)为0.59%,样品加标回收率为99.3%~100.9%。经过多家实验室间的比对实验,证明该方法准确度高,具有较好的应用效果。
Tourmaline is a boron containing aluminosilicate mineral.It is a sensitive tracer of diagenesis and mineralization.By testing the contents of iron oxide in tourmaline of surrounding rocks,the origin of tourmaline-bearing bderock can be identified.However,there is no systematic standard analysis method and standard substance of chemical compositions of tourmaline,and the study on ferrous oxide analysis method of tourmaline is rather rare.In this paper,by adding phthalazine to form a complex with ferrous metal in the process of ore dissolving,agood solution and protection effect can be obtained for ferrous metal.A tetrafluoroethylene crucible is added to polyphenanthroline,hydrofluoric acid and sulfuric acid,and the medium and high temperature heating plate is used to heat the ore and determine the ferrous contents in the tourmaline by the potassium dichromate capacity method.The precision of the method(RSD,n=12)is 0.59%,and the rate of recovery is 99.3%~100.9%.Through comparison experiments among many laboratories,it is proved that the method is of high accuracy and good application effect.
Tourmaline is a boron containing aluminosilicate mineral.It is a sensitive tracer of diagenesis and mineralization.By testing the contents of iron oxide in tourmaline of surrounding rocks,the origin of tourmaline-bearing bderock can be identified.However,there is no systematic standard analysis method and standard substance of chemical compositions of tourmaline,and the study on ferrous oxide analysis method of tourmaline is rather rare.In this paper,by adding phthalazine to form a complex with ferrous metal in the process of ore dissolving,agood solution and protection effect can be obtained for ferrous metal.A tetrafluoroethylene crucible is added to polyphenanthroline,hydrofluoric acid and sulfuric acid,and the medium and high temperature heating plate is used to heat the ore and determine the ferrous contents in the tourmaline by the potassium dichromate capacity method.The precision of the method(RSD,n=12)is 0.59%,and the rate of recovery is 99.3%~100.9%.Through comparison experiments among many laboratories,it is proved that the method is of high accuracy and good application effect.
引文
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[2]蒋少涌,于际民,倪培,等.电气石——成岩成矿作用的灵敏示踪剂[J].地质论评,2000,46(6):594-604.
[3]黄雪飞,张宝林,李晓利,等.电气石研究进展及其找矿意义[J].黄金科学技术,2012,20(3):56-65.
[4]王进军,赵枫.电气石的化学特征与相关矿床的关系[J].地质找矿论丛,2002,17(3):162-163
[5]Franco Pirajno.The FeO/(FeO+MgO)ratio oftourmaline:a useful indicator of spatial variationsin graniterelated hydrothemal mineral deposits[J].Journal of Geochemical Exploration,1992,42:371-381.
[6]叶松.山西中条山铜矿田电气石与电气石岩的研究[J].岩石矿物学杂志,1997,16(2):160-169.
[7]孙海田.中条山铜矿区电气石特征及其对成矿作用的示踪意义[J].岩石矿物学杂志,1989,8(3):232-242.
[8]夏学惠.辽东裂谷带硫化物矿床内电气石系列矿物学与找矿关系[J].矿物岩石,1995,15(4):62-71.
[9]王登红.广西大厂电气石的成分与成因初探[J].岩石矿物学杂志,1996,15(3):280-288.
[10]岩石矿物分析编委会.岩石矿物分析(第四版第二分册)[M].北京:地质出版社,2011:34-35,111-112,170-171,393-394.
[11]地质矿产部科学技术司实验管理处.岩石和矿物分析规程(第二分册)[M].西安:陕西科学技术出版社,1994:111-112.
[12]B.B.涅克拉索夫.普通化学教程[M].北京:高等教育出版社,1956:791.
[13]王峰.难溶铁矿石中氧化亚铁的测定方法探讨[J].科技创业月刊,2013(8):185-186.
[14]唐碧玉.电气石矿物的全分析[J].冶金分析,1989,9(1):63.
[15]陈寿椿.重要无机化学反应[M].上海:科学技术出版社,1982:320-321.
[16]张会堂,刘瑄.邻菲啰啉在测定亚铁中的保护效果[J].山东地质,2003,19(1):54-56.
[17]成学海.封闭压力酸溶-电感耦合等离子体质谱法同时测定电气石中29种元素[J].岩矿测试,2017,36(3):232.
[18]薛建玲.辽宁后仙峪硼矿床中电气石矿物学特征及成岩成矿意义[J].中国地质,2006,33(6):1386-1391.
[19]成学海.山东省邹城电气石应用基础研究[J].矿冶,2004,13(3):91-94.