纳氏试剂法测定高浓度钙镁水中的低浓度氨氮  

Determination of Low-concentration Ammonia Nitrogen in High Calcium and Magnesium Water Using Nessler Reagent Method

作　　者：冉争艳 RAN Zheng-yan(Environmental Protection Bureau of Yanhe Tujia Autonomous County of Guizhou Province, Guizhou Yanhe 565300, Chin)

机构地区：[1]贵州省沿河土家族自治县环境保护局,贵州沿河565300

出　　处：《广州化工》2017年第15期154-156,共3页GuangZhou Chemical Industry

摘　　要：氨氮是评价水体受人为影响程度的重要参数,也因此被我国纳入主要污染物排放总量控制指标,正确有效地检测水体氨氮适时浓度,为评估水体水质变化趋势提供了基础数据保障。本文采取研究区实际水样,讨论氨氮测定的最大干扰以及如何有效避免干扰的问题。结果表明:当水中钙镁离子总量大于1 mmol/L时,比色管中溶液显色反应会受到浑浊干扰而影响测定;在加入纳氏试剂显色前,向比色管中加入1 m L酒石酸钾钠和1 m L氢氧化钠做掩蔽剂,能有效避免浑浊问题。Ammonia nitrogen is an important parameter to evaluate the water by human impact, therefore it was subsumed into the total emission control indicators of major pollutants inChina. Correct and effective detection of timely concentration of ammonia nitrogen in water can provide a data base for assessing the trend of water quality change. The actual water samples in the study area were taken to analyze the maximum interference of ammonia nitrogen measurement, and how to effectively avoid the interference problem. The results showed that when the total amount of calcium and magnesium ions in the water was more than 1 mmol/L, the color reaction of the solution in the colorimetric cylinder was affected by turbidity. Before the Nessler reagent, adding 1 mL potassium sodium tartrate and 1 mL sodium hydroxide as masking agent can effectively avoid the phenomenon of turbidity.

关 键 词：纳式试剂 氨氮 钙镁 掩蔽剂 

分 类 号：X83[环境科学与工程—环境工程]