流动注射-分光光度法测定河口水中氨氮的盐效应及校正
Establishing a Method to Study Salt Effect of Ammonia in Estuarine Water with Flow Injection Spectrophotometry
摘 要
建立了流动注射-分光光度法测定河口水中氨氮的盐效应的校正办法.样品溶液中的钙离子、镁离子是造成盐效应的主要因素.低盐区域(盐度0~10)随盐度增加,校正系数迅速降低;高盐区域(盐度10~30)随盐度增加,校正系数缓慢增加.氨氮的线性范围为3.00~300 μg·L-1,方法的检出限(3S/N)为1.97 μg·L-1.对20.0 μg·L-1氨氮标准溶液连续测定7次,测定值的相对标准偏差为4.5%.用标准加入法做方法的回收试验,测得回收率在80.7%~108%之间.
河口水
流动注射
氨氮
盐效应
Spectrophotometry
Estuarine water
Flow injection
Ammonia
Salt effect
Abstract
This experiment aims to establish a correction method to study salt effect of ammonia in estuarine water with flow injection spectrophotometry. The experiment result suggests that salt effect is largely contributed by Ca2+ and Mg2+ in the solution . In low salt concentration (salinity from 0 to 10),correction coefficient decreased rapidly with increase in salinity;in high salt concentration (salinity from 10 to 30),correction coefficient increased slowly with increase in salinity. Linearity range of ammonia was found in the range of 3.00-300 μg·L-1 with detection limit (3S/N) of 1.97 μg·L-1. Precision of the method was tested at the concentration level of 20.0 μg·L-1 ammonia standard solution for 7 determination,value of RSD found was 4.5%. Test for recovery was performed by standard addition method,giving values of recovery in the range of 80.7%-108%.
中图分类号 O657.32
所属栏目 工作简报
基金项目 国家高技术研究发展(863)计划(2007AA092001)
收稿日期 2014/2/21
修改稿日期
网络出版日期
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联系人作者杨颖(YANG8304@163.com)
备注杨颖(1976-),女,天津宁河人,高级工程师,硕士,研究方向为海洋环境监测、评价与光谱分析.
引用该论文: YANG Ying,CHENG Xiang-sheng,ZHANG Hui. Establishing a Method to Study Salt Effect of Ammonia in Estuarine Water with Flow Injection Spectrophotometry[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2015, 51(2): 197～199
杨颖,程祥圣,张辉. 流动注射-分光光度法测定河口水中氨氮的盐效应及校正[J]. 理化检验－化学分册, 2015, 51(2): 197～199
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参考文献
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【2】张卫宏,赵萍.海水中氨氮的流动注射光度法分析[J].海洋环境科学,2013(2):131-133.
【3】朱敬萍,郭远明,陈瑜.流动注射法测定海水中的氨氮[J].浙江海洋学院学报:自然科学版,2012(2):178-181.
【4】王锋,李玉环.靛酚蓝光度法测定海水中的氨型氮[J].海洋技术,2002,21(3):631-633.
【5】AMINOT A,KEROUEL R.Stability and preservation of primary calibration solutions of nutrients[J]. Marine Chemistry,1996,52(20):173-181.
【6】高玉安.靛蓝法测氨之盐度效应的剖析和pH校正及试剂配方改良之研究［D］.基隆:国立台湾海洋大学水产养殖研究所,1999.
【7】PAI S C,TSAU Y J,YANG T I. pH and buffering capacity problems involved in the determination of ammonia in saline water using the indophenol blue spectrophotometric method[J]. Anal Chim Acta,2001,434(2):209-216.
【8】锺仕伟,温良硕,庄佳颖,等.盐度效应对营养盐测定之影响[J].中国化学会(台北),2001,59(3):311-316.
【9】杨颖,刘鹏霞,杨幸幸,等.流动注射-分光光度法测定河口水中磷酸盐及盐效应的校正办法[J].理化检验-化学分册,2011,47(10):1203-1205.
【10】GB 17378.2-2007海洋监测规范［S］.
【11】马锦如.基体效应及空白在不同校准方法中的影响和校正[J].环境监测管理与技术,1993,5(2):7-9.
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