论文部分内容阅读
在水质分析中用容量法测定甲基橙碱度时常用0.1％甲基瞪作指示剂,由于甲基瞪终点不够灵敏,红黄界限不明,误差较大。曾有人改用甲基红-亚甲基蓝混合指示剂,这种指示剂灵敏度较高,终点界限也很清楚,但是由于混合指示剂是用96％的酒精溶液配制,久置后由于甲基红
In the water quality analysis of methyl orange alkalinity by volumetric method commonly used as indicator of methyl methyl 0.1%, due to the methyl radical end point is not sensitive enough, the red-yellow boundary is unknown, the error is larger. Some people have to use methyl red - methylene blue mixed indicator, this indicator high sensitivity, the endpoint limit is also very clear, but because the mixed indicator is formulated with 96% alcohol solution for a long time after the methyl red