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痕量氯离子的测定方法甚多。在pH值略高于3的条件下,以磷酸铅盐作载体,共沉淀富集氯离子,高速离心分离后,用高氨酸-硝酸铁混合液溶解沉淀,然后加硫氰酸汞-甲醇溶液显色,测定高纯水中痕量氯离子的共沉淀富集吸光光度法,操作方便,检出浓度为2微克·升~(-1)。但不足之处是空白水(无氯水)的制作过程繁杂,并且在测定时忽略了空白水中的氯离子含量,当被测水样的含CI~-量很低时,误差较大。本文提出以高纯水(二级除盐水)代替无氯水,用单、双倍试剂法分别测定试剂空白吸光度和高纯水空白吸光度,可以简化分析手续,提高测定精度。
Determination of trace chloride ion many ways. At pH slightly higher than 3 under the conditions of lead phosphate salt as a carrier co-precipitation enrichment of chloride ions, high-speed centrifugation, with high-acid - ferric nitrate solution to dissolve the precipitate, and then add mercuric thiocyanate - methanol The color of the solution was determined, and the co-precipitation enrichment spectrophotometry was established for the determination of trace chloride in high purity water. The operation was convenient and the detection concentration was 2 μg · L -1. However, the disadvantage is that the manufacturing process of blank water (chlorine-free water) is complicated, and the chloride ion content in the blank water is neglected in the measurement. When the measured water content is too low, the error is large. In this paper, high purity water (secondary demineralized water) instead of chlorine-free water, single and double reagents were measured reagent blank absorbance and high pure water blank absorbance, can simplify the analysis procedures and improve the determination accuracy.