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材料所四室推荐的铅锌连测方法(本刊1966年,5、6期,95页),用酒石酸铵,三乙醇胺,氰化钾等联合隐蔽锡、铜、铁等干扰元素,借络黑 T 指示而连测铅锌,此法在实际应用中存在着矛盾,即指示剂的用量问题。由于三乙醇胺的存在,指示剂用量若少了,则铅的终点不明晰;指示剂用量多一点,虽可使铅的终点易于观察,但锌的终点颜色则嫌太深,突跃不明显。而且在整
Material room four rooms recommended lead-zinc test method (published in 1966, 5,6, 95), with ammonium tartrate, triethanolamine, potassium cyanide and other concealed tin, copper, iron and other interference elements, Black T instructions and even measure lead and zinc, this method in practice there is a contradiction, that is, the amount of indicator. Due to the presence of triethanolamine, the indicator of the amount of less, the end of the lead is not clear; indicator a little more dosage, although the end point of lead can be easily observed, but the endpoint color of zinc is too deep, the jump is not obvious. And in the whole