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多波长法用于减小浊度对水源水中甲醛测定结果的影响
引用本文:赖永忠,王一刚.多波长法用于减小浊度对水源水中甲醛测定结果的影响[J].中国环境监测,2015,31(6):91-96.
作者姓名:赖永忠  王一刚
作者单位:汕头市环境保护监测站, 广东汕头 515041,汕头市环境保护监测站, 广东汕头 515041
摘    要:比较了减小水样浊度对样品结果影响的各种方法,包括过滤法、双波长法、三波长法,3种方法均基于乙酰丙酮分光光度法,测定波长均为414 nm。结果表明,以480 nm为参比波长的双波长法所得方法检出限为0.027 mg/L,采用470 nm与360 nm、460 nm与370 nm、450 nm与380 nm 3对参比波长的三波长法测得方法检出限为0.025~0.028 mg/L,这些方法用于检测0.100 mg/L标准点样品时,检测结果 RSD介于8.0%~8.6%。双波长法适合低浊度样品的直接分析,而浊度较高或双波长法测得结果大于方法检出限时,应采用三波长法进行定量分析,他们的使用有助于提高方法的准确度及减少工作量。用于地表水样品分析时,0.200、0.400 mg/L加标样品的回收率介于90.3%~101%,对应RSD介于0.0%~4.2%。

关 键 词:甲醛  乙酰丙酮  浊度  过滤  双波长  三波长  分光光度法
收稿时间:2014/9/30 0:00:00
修稿时间:2014/10/21 0:00:00

Effect Elimination of Turbidity on Results of Formaldehyde in Drinking Source Water Samples
LAI Yong-zhong and WANG Yi-gang.Effect Elimination of Turbidity on Results of Formaldehyde in Drinking Source Water Samples[J].Environmental Monitoring in China,2015,31(6):91-96.
Authors:LAI Yong-zhong and WANG Yi-gang
Institution:Shantou Enviromental Monitoring Station, Shantou 515041, China and Shantou Enviromental Monitoring Station, Shantou 515041, China
Abstract:Filtration, dual-wavelength method, triplex-wavelength method were used to eliminate the interference of turbidity for formaldehyde in drinking source waters, and formaldehyde was determined with acetylacetone spectrophotometric method with measuring wavelength 414 nm. Results showed that dual-wavelength method(reference wavelength:480 nm) and triplex-wavelength method(reference wavelengths:470 nm & 360 nm, 460 nm & 370 nm and 450 nm & 380 nm) were more suitable for samples with different turbidities, and limitations(LD=3.143s) of them were 0.025-0.028 mg/L with RSD 8.0%-8.6%. Dual-wavelength method and triplex-wavelength methods had simple, less workload and better accuracy advantage, while dual-wavelength method was more suitable for samples with low turbidity, all of them were used to detect formaldehyde in drinking source water samples with recoveries 90.3%-101% and RSD 0.0%-4.2%.
Keywords:formaldehyde  acetylacetone  turbidity  filtration  dual-wavelength  triplex-wavelength  spectrophotometric method
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