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本文研究了有Na~+、NH_4~+、K~+、Mg~(2+)、Ca~(2+)、Fe~(3+)等离子存在下,以改进的茜素红S法,用氯化钡标准液直接滴定硫酸根的方法.硫酸根在24—60毫克范围内,可以准确地测定,最大相对误差不超过0.4％。本法的特点是采用混合指示刺,严格控制终点前的PH值为4和降低乙醇含量为20％的情况下,以茜素红S作指示剂,可得到明显的由黄绿到淡红色的突变终点。并通过加入氟化铵和氨化后Cl~-补偿的办法,可以消除有干扰的Na~+、K~+、Mg~(2+)、Ca~(2+)、Fe~(3+)等离子,解决了准确测定硫酸根的问题。因而本法也很适合芒硝联合制碱工艺中,有不同Na~+/NH_4~+比的情况下硫酸根的测定。
In this paper, Alizarin red S method was used in the presence of Na ~ +, NH_4 ~ +, K ~ +, Mg ~ (2+), Ca ~ (2 +) and Fe ~ Barium chloride standard titration method of sulfate. Sulfate in the 24-60 mg range, can be accurately measured, the maximum relative error of not more than 0.4%. This method is characterized by mixed indication of thorns, strict control of the endpoint before the PH value of 4 and reduce the ethanol content of 20% of the case, the alizarin red S as an indicator, you can get obvious from yellow-green to light red Mutation end point. And by adding ammonium fluoride and ammoniated Cl ~ - compensation method can eliminate the interference of Na ~ +, K ~ +, Mg ~ (2 +), Ca ~ (2 +), Fe ~ Plasma, solve the problem of accurate determination of sulfate. Therefore, this method is also very suitable for the determination of sulfate in the case of different Na ~ + / NH_4 ~ + ratio in the sodium sulfate process.