褐煤中金属元素对容量法测定黄腐酸碳含量的影响

Influence of Some Metal Elements in on the Determination of Carbon Content by Volumetric Method

探讨了一些金属元素对容量法测定碳含量的影响。结果表明:黄腐酸溶液中的还原态变价金属元素使测定结果偏大;Mg等金属元素会抑制黄腐酸碳含量的测定,使结果偏小。本文比较了磷酸三钠和氢氧化钠作为沉淀剂去除黄腐酸溶液中的金属离子的效果,两种沉淀剂脱除金属效果显著,但氢氧化钠做沉淀剂共沉淀现象明显,磷酸三钠脱除金属离子效果优于氢氧化钠。

Abstract： Influence of some chemical elements on the determination of carbon content by volumetric method was stud- ied. The results shows： carbon content was increase because of some reduced state varied valence chemical elements; carbon content was lower, because of the inhibition by chemical elements. Trisodium phosphate and sodium hydroxide are selected as a precipitating agent to remove metal ions in the solution of fulvic acid, and the result of them was very obviously, the co-precipitation phenomenon was obviously by sodium hydroxide, the result that Trisodium phosphate was selected as precipitating agent was better than the result of sodium hydroxide as precipitating agent.