论文部分内容阅读
目的 研究AFS-230双道原子荧光光度计同时测定饮用水中的砷(As)和汞(Hg)的方法,为检测水样中的砷和汞提供依据.方法 研究负高压、灯电流、载气和屏蔽气流速、原子化高度、盐酸浓度和硼氢化钾浓度等因素对检测的影响.在仪器最佳工作条件下进行检出限、线性范围、精密度、加标回收率等研究.结果 砷和汞的质量浓度分别在0~20ng/mL和0~1.0ng/mL范围时呈现良好的线性关系,相关系数均在0.9 997以上;砷和汞的检出限分别为0.0 034ng/mL和0.0004ng/mL.对于不同含量的砷汞混合溶液进行测定,相对标准偏差分别<0.7%和1.0%(n=11),加标回收率在96%~105%之间.结论 本方法操作简便、灵敏度高、精密度好、快速、便于推广,适用于生活饮用水中的砷和汞的测定.“,”Objective To study the method of AFS-230 dual channel atomic fluorescence spectrometer determination of arsenic and mercury in drinking water,provided basis for detecting arsenic and mercury in water samples.Method Studying the effect of negative high voltage,lamp current,carrier gas and shielding gas flow rate,atomization height,hydrochloric acid and potassium borohydride concentration on detection.At the best working conditions of instrument,studied the detection limit,linearity range,precision and addition standard recovery and so on.Results The concentration of arsenic and mercury respectively at the range of 0~20ng/mL and 0~1.0ng/mL showed good linear relation,correlation coefficient were all above 0.9 997;arsenic and mercury detection limits were 0.0 034ng/mL and 0.0 004ng/mL respectively.Detecting the mixed solution contain arsenic and mercury,the relative standard deviation were less than 0.7% and 1.0%(n=11) respectively and recovery rate was between 96% to 105%.Conclusions This method was simple,high sensitivity,good precision,fast and convenient for widely application,it suited for arsenic and mercury determination and with satisfactory results.