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地表水中甲醛的光谱吸收曲线-线性拟合斜率-乙酰丙酮分光光度法检测
Formaldehyde Determination by Optimized Spectral Absorption Curve-Linear Fitting Slope-Spectrophotometric Method
投稿时间:2018-11-09  修订日期:2019-02-13
DOI:10.19316/j.issn.1002-6002.2019.05.18
中文关键词:  甲醛  乙酰丙酮  光谱吸收曲线  线性拟合  斜率  浊度  分光光度法  优化
英文关键词:formaldehyde  acetylacetone  spectral absorption curve  linear fitting  slope  turbidity  spectrophotometric method  optimation
基金项目:汕头市科技计划项目“韩江原水不同消毒过程副产物生成特性及风险控制技术研究”(2016-40);汕头职业技术学院科研课题(SZK2018Q04)
作者单位
吴悦 汕头职业技术学院自然科学系,广东 汕头515041 
赖永忠 汕头大学海洋生物研究所, 广东省海洋生物技术重点实验室,广东 汕头515063
汕头市环境保护监测站,广东 汕头515041 
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中文摘要:
      光谱吸收曲线-线性拟合斜率-分光光度法(SAC-LFS-S)用于检测地表水中甲醛尚存准确度不足问题,通过筛选合适的参比波长段,使SAC-LFS-S法准确度进一步提高。以试剂空白和浊度梯度地表水样品的检测结果及方法检出限为主要筛选对象,得到425~435、420~435、420~440、415~440、415~445、410~445、415~450、410~450、455~495、410~455、405~455、450~500 nm等共12个合适的测定波长段;再选择试剂空白结果较低、批间重复性较好的450~500 nm测定波长段,筛选参比波长段(455~465、480~495、450~490 nm共3个)。结果表明:优化后SAC-LFS-S法线性范围为0.100~3.00 mg/L,方法检出限为0.025~0.033 mg/L;优化前、后方法测得部分地表水样品结果分别为有检出和未检出,回收率为73.4%~108.8%,后者与无亮黄色化合物产生的实验现象更吻合。经参比波长段校正的SAC-LFS-S法具有更高的准确度,非常适用于地表水中甲醛的直接测定。
英文摘要:
      The accuracy of spectral absorption curve-linear fitting slope-spectrophotometric method (SAC-LFS-S) was not good enough for formaldehyde determination in surface water samples, while it can be improved by appropriate reference wavelength ranges. The measuring wavelength ranges were screened based on better accuracy of surface water samples with different turbidities, blank samples and method detection limits. Results showed that 425-435,0-435,0-440,5-440,5-445,0-445,5-450,0-450,5-495,0-455,5-455, 450-500 nm can be used as measuring wavelength ranges, and 450-500 nm was further studied for its smaller and better precision of blank samples′ results. The SAC-LFS-S method with measuring wavelength range 450-500 nm and three reference wavelength ranges (455-465,0-495, 450-490 nm), the linearity range of which was 0.100-3.00 mg/L, had good method detection limits(0.025-0.033 mg/L). When optimized SAC-LFS-S method was used to determine actual samples, the yellow reaction products did not generate, and the not detected results were matched to the experiment phenomenon. Compare to SAC-LFS-S method, the optimized SAC-LFS-S method with recoveries 73.4% to 108.8%, was more suitable for formaldehyde determination in surface water.
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