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抗坏血酸作还原滴定剂 连续测定铁矿中的全铁和亚铁 被引量:1
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作者 马秀卿 宣春生 石富 《太原理工大学学报》 CAS 1987年第1期4-11,共8页
本文采用硫酸—盐酸—氢氟酸溶矿,用稳定的抗坏血酸作还原滴定剂,以磺基水杨酸为指示剂,滴定铁矿中的高铁后,溶液用过硫酸铵完全破坏抗坏血酸亚铁络合物,并氧化所有亚铁成为高铁,然后再用抗坏血酸滴定其中的全铁,以此达到全铁和亚铁的... 本文采用硫酸—盐酸—氢氟酸溶矿,用稳定的抗坏血酸作还原滴定剂,以磺基水杨酸为指示剂,滴定铁矿中的高铁后,溶液用过硫酸铵完全破坏抗坏血酸亚铁络合物,并氧化所有亚铁成为高铁,然后再用抗坏血酸滴定其中的全铁,以此达到全铁和亚铁的连测。本法操作简单,并消除了汞、铬对水体的污染。文中应用本法对六种含铁量不同的铁矿管理样进行了测定,其结果和原结果基本符合,相对误差一般不超过千分之五。 展开更多
关键词 抗坏血(维生素C) 还原滴定剂 磺基水相酸 污染 管理样
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Phase Behavior and Structural Transitions in Sodium Dodecyl Sulfonate Microemulsions 被引量:1
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作者 杨根生 施介华 +2 位作者 李景华 王普 姚善泾 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2002年第6期670-672,共3页
The forming mechanism of microemulsion of sodium dodecyl sulfonate, alcohols,water and isooctane was studied, with particular emphasis on the effect of molecular weight andconcentration of alcohols. Phase diagram of t... The forming mechanism of microemulsion of sodium dodecyl sulfonate, alcohols,water and isooctane was studied, with particular emphasis on the effect of molecular weight andconcentration of alcohols. Phase diagram of the four components, alcohol, sodium dodecyl sulfonate,water and isooctane, was used as a means of study, through which the microemulsion regions weredetermined. Phase diagram of sodium dodecyl sulfonate/n-pentanol/isooctane/water system at κ_m = 2(κ_m = W_(n-pentanol)/W_(SDS)) is presented. The variation of conductivities of differentmicroemulsion samples with water was measured. From the conductivities we investigated a change instructure from water droplets in oil (W/O) at low water content to liquid crystal at intermediatewater content and a stricture of oil droplets in water (O/W) at high water content. 展开更多
关键词 sodium dodecyl sulfonate ALCOHOL MICROEMULSION phase behavior CONDUCTIVITY
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