亚硝酸盐氮对次溴酸钠氧化法氨氮测定的影响
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摘要
次溴酸盐氧化法是一种海水或高盐度水质氨氮的常用检测方法,但实验发现该方法在亚硝酸盐氮存在时氨氮测定结果有较大误差。研究了次溴酸盐氧化法中亚硝酸盐氮对氨氮测定结果的影响。结果显示,氨氮的测量误差随着水样中亚硝酸盐氮含量的升高而变大,且具有明显的正相关性;探讨误差产生的机理发现,误差可能是次溴酸盐不能将氨氮完全氧化为亚硝酸盐氮导致的;研究了氧化率的影响因素发现,氧化时间对氧化率的影响可忽略,温度对氧化率有很大影响。在室温为(23±1)℃时,拟制出亚硝酸盐氮浓度对氨氮测量绝对误差的影响曲线,曲线方程为y=1.834x+0.018,r=0.996 7。利用修订的氨氮测定计算公式,可大大提高亚硝酸盐氮存在时水中氨氮的测量精度。
Hypobromite oxidation is a common method used to detect ammonia nitrogen in seawater or high-salinity water. But the existence of nitrite nitrogen may lead to great error for the measurement of ammonia nitrogen. This study investigated the effect of nitrite nitrogen on the measurement of ammonia nitrogen with the method of hypobromite oxidation. The results showed that error of ammonia nitrogen became greater with the increasing concentration of nitrite nitrogen in sample and measurement error had a significant positive correlation with nitrite nitrogen concentration. This study also investigated the mechanism of error production,and it was found that incomplete oxidation of nitrite nitrogen by hypobromite may be the reason lead to the error. It was found that reaction time had no effect on the result while the temperature had effect to the result. The influence curve ammonia nitrogen error affected by nitrite nitrogen's concentration in( 23 ± 1) ℃ was traced in this study. The curve equation is y = 1. 834 x + 0. 018,r =0. 9967. The measurement accuracy of ammonia nitrogen could be greatly increased by this formula when nitrite nitrogen existed.
Hypobromite oxidation is a common method used to detect ammonia nitrogen in seawater or high-salinity water. But the existence of nitrite nitrogen may lead to great error for the measurement of ammonia nitrogen. This study investigated the effect of nitrite nitrogen on the measurement of ammonia nitrogen with the method of hypobromite oxidation. The results showed that error of ammonia nitrogen became greater with the increasing concentration of nitrite nitrogen in sample and measurement error had a significant positive correlation with nitrite nitrogen concentration. This study also investigated the mechanism of error production,and it was found that incomplete oxidation of nitrite nitrogen by hypobromite may be the reason lead to the error. It was found that reaction time had no effect on the result while the temperature had effect to the result. The influence curve ammonia nitrogen error affected by nitrite nitrogen's concentration in( 23 ± 1) ℃ was traced in this study. The curve equation is y = 1. 834 x + 0. 018,r =0. 9967. The measurement accuracy of ammonia nitrogen could be greatly increased by this formula when nitrite nitrogen existed.
引文
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[13]盛骤,谢式千,潘承毅.概率论与数理统计[M].北京:高等教育出版社,2008:385.
[2]EBELING J M,TIMMONS M B,BISOGNI J J.Engineering Analysis of the Stoichiometry of Photoautotrophic,Autotrophic,and Heterotrophic Removal of Ammonia-Nitrogen in Aquaculture Systems[J].Aquaculture,2006,257(1-4):346-358.
[3]MOOK W T,CHAKRABARTI M H,AROUA M K,et al.Removal of Total Ammonia Nitrogen(TAN),Nitrate and Total Organic Carbon(TOC)From Aquaculture Wastewater Using Electrochemical Technology:A review[J].Desalination,2012,285(3):1-13.
[4]LANDAU M,PIERCE R H,WILLIAMS L D,et al.Contamination and Growth of the Shrimp,Penaeus Stylirostris Stimpson,Cultured in a Seawater/Wastewater Aquaculture System.[J].Bulletin of Environmental Contamination&Toxicology,1985,35(1):537-545.
[5]王玮,谭潇也,孙贤风,等.海洋硝化细菌富集培养过程研究[J].青岛理工大学学报,2006,27(3):67-70.WANG Wei,TAN Xiaoye,SUN Xianfeng,et al.A Study on Marine Nitrifying Bacteria Enrichment Cultivation Process[J].Journal of Qingdao Technological University,2006,27(3):67-70.
[6]蒋岳文,马英.靛酚蓝分光光度法测定海水中氨氮最佳条件的选择[J].海洋环境科学,1997(4):43-47.JIANG Yuewen,MA Ying.Selection of Favorable Condition for The Measurement of Ammonia in Seawater with Spectrophotometer[J].Marine Environmental Science,1997(4):43-47.
[7]任妍冰,焦云.次溴酸盐氧化法测定海水氨氮影响因素的探讨[J].污染防治技术,2011(5):52-53.REN Yanbing,JIAO Yun.A Discussion on The Influencing Factors of NH3-N in Seawater Determination Using Hypobromate Oxidimetry[J].Pollution Control Technology,2011(5):52-53.
[8]张健,章文军,裘琼芬,等.氨氮次溴酸钠氧化测定法的改良[J].环境科学与技术,2011,34(11):126-129.ZHANG Jian,ZHANG Wenjun,QIU Qiongfen,et al.Improving Sodium Hypobromite Oxidation Method for Ammonia Nitrogen Determination[J].Environmental Science&Technology,2011,34(11):126-129.
[9]杨翠凤,李俊荣.海水中氨氮测定方法—纳氏试剂比色法与次溴酸盐氧化法的对比研究[J].浙江化工,2005,36(7):31-32.YANG Cuifeng,LI Junrong.Investigation on Contrasting Between Nessler's Reagent Colorimetry and Hypo Bromate Oxidimetry to Determine NH3-N in Sea Water[J].Zhejiang Chemical Industry,2005,36(7):31-32.
[10]国家环境保护总局.水和废水监测分析方法[M].4版.北京:中国环境科学出版社,2002.
[11]高凤鸣,张淑华,汪心源,等.用次溴酸钠氧化法测定海水中氨氮的研究[J].海洋湖沼通报,1980(4):71-77.GAO Fengming,ZHANG Shuhua,WANG Xinyuan,et al.Study on The Determination of Ammonia-Nitrogen in Seawater with The Sodium Hypobromite Oxidation Method[J].Transaction of Oceanology and Limnology,1980(4):71-77.
[12]邓勃.关于校正曲线建立和应用中一些问题的探讨[J].中国无机分析化学,2011,1(3):1-7.DENG Bo.The Discussion on Some Problems with Construction And Application of Calibration Curve[J].Chinese Journal of Inorganic Analytical Chemistry,2011,1(3):1-7.
[13]盛骤,谢式千,潘承毅.概率论与数理统计[M].北京:高等教育出版社,2008:385.