气相分子吸收光谱法测定废水中氨氮和硫化物研究
2021-03-28乔茜茜雷静廖爽吕警
乔茜茜 雷静 廖爽 吕警



摘 要:应用气相分子吸收光谱法测定废水中氨氮和硫化物含量,结果表明所提方法的标准曲线、检出限、精密度及准确度均符合监测规范要求,分析结果可靠。在实样测试中,所提方法具有较强的适用性,且样品测试中不受水样颜色和浑浊物的影响,监测速度非常快,精密度较高,加标回收率可以达到93.8%~99.9%。
关键词:氨氮;硫化物;氨氮除亚氮;气相分子吸收光谱仪
中图分类号:O657.3;X832 文献标识码:A 文章编号:1003-5168(2021)34-0-03
Research on Determination of the Ammonia Nitrogen and Sulfide in
Wastewater by Gas Phase Molecular Absorption Spectrometry
QIAO Qianqian LEI Jing LIAO Shuang LYU Jing
(1.Xinjiang Changyuan Water Science Research Institute Co., Ltd., Urumqi Xinjiang 830000;
2.Quality and safety testing center of Urumqi Agricultural Products, Urumqi Xinjiang 830000)
Abstract: In this paper, gas phase molecular absorption spectrometry was used to determine ammonia nitrogen and sulfide in wastewater. The results show that the standard curve, detection limit, precision and accuracy of the method are conform to the requirements of the monitoring specification, and the analysis results are reliable. In the real sample test, the method has strong applicability, and it is not affected by the color and turbidity of water samples in the sample test. The whole monitoring speed is very fast, the precision is high, and the recovery rate of standard addition can reach 93.8%~99.9%.
Keywords: ammonia nitrogen;sulfide;ammonia nitrogen removal nitrous;gas phase molecular absorption spectrometer
随着我国制药、化工等行业的快速发展,产生了大量含硫含氮废水。此类废水具有硫、氮污染物的双重危害,排入水体后不仅会产生大量含硫、含氮污染物,还会消耗大量溶解氧,造成水体黑臭[1]。另外,废水中生成的氨还会在一定条件下转化成具有毒性的亚硝酸盐,如果进入人体内将会与血红蛋白结合形成高铁血红蛋白,导致人体缺氧,造成极为严重的危害[2]。因此,快速准确地监测出废水中的硫化物、氨氮尤为重要。国家标准中测定废水中氨氮、硫化物分别采用纳氏试剂分光光度法和亚甲基蓝分光光度法[3]。纳氏试剂法需要使用有毒的汞盐,亚甲基蓝法灵敏度低,操作步骤烦琐,且这两种方法均受水样颜色和浊度的影响,增加了检测难度,降低了准确度。
气相分子吸收光谱法作为一种新的分析技术,应用于废水氨氮、硫化物的测定,可以在2 min内完成取样与结果分析的整个流程。整个监测速度快,并可自动进样,适合大批量样品检测,且抗干扰性强,省略了蒸馏、氮吹等步骤,不受水样颜色和浑浊物的影响,特别适用于污水检测。……
