水处理剂聚氯化铝中砷的原子荧光测定法_吴惠刚

水处理剂聚氯化铝中砷的原子荧光测定法【实验·监测与检验】DeterminationofArsenicinWaterTreatmentAgentPolyaluminiumChloridebyAtomicFluorescenceSpectrometry吴惠刚,黄诚,周日东,冯银凤,丁丽燕WUHui-gang,HUANGCheng,ZHOURi-dong,FENGYin-feng,DINGLi-yan摘要目的探索并建立检测水处理剂聚氯化铝中砷的原子荧光分析方法。方法以湿式消化法对水处理剂聚氯化铝进行消解预处理,以原子荧光法对水处理剂聚氯化铝中的砷进行检测,然后对方法的标准曲线相关系数以及方法的精密度和准确度进行分析。结果砷浓度在0～50.0μg/L范围内线性关系良好,相关系数r>0.999,方法最低检出浓度为0.018μg/g(以取1g聚氯化铝样品进行消解,消化处理后定容至50ml分析算),样品加标回收率为94.1%～104.8%,相对标准偏差<5%。结论水处理剂聚氯化铝中砷的检测,样品经湿式消化预处理后,以原子荧光法进行检测,所得结果满足检测的要求。关键词原子荧光法;预处理;水处理剂;聚氯化铝;砷中国图书资料分类号:R115文献标识码:B文章编号:1004-1257(2009)16-1716-02SubjectDeterminationofArsenicinWaterTreatmentAgentPolyaluminiumChloridebyAtomicFluorescenceSpectrometryAuthorsWUHui-gang,HUANGCheng,ZHOURi-dong,etal.(ZhongshanCenterforDiseaseControlandPrevention,Guang-dong,528403,China)Abstract[Objective]Toestablishamethodfordetectingarsenicinwatertreatmentagentpolyaluminiumchloridebyatomicfluo-rescencespectrometry(AFS).[Methods]ThearsenicwasdetectedbyAFSafterwatertreatmentagentpolyaluminiumchloridewaspretreatedwithwetdigestionmethod.Thenthestandardcurvecorrelationcoefficientaswellasprecisionandaccuracyofthemethodwasanalyzed.[Results]Arsenicconcentrationshowedagoodlinearrelationshipbetween0～50.0μg/L,correlationcoefficientr>0.999,theminimumdetectableconcentrationwas0.018μg/g(calculationbasedondigesting1gpolyaluminiumchlorideandfixingvolumeat50ml.)Thelabeledrecoveryrateofarsenicwasbetween94.1%and104.8%;relativestandarddeviationwasbelow5%.[Conclusion]TheresultsofarsenicdeterminationinwatertreatmentagentpolyaluminiumchloridebywetdigestionpretreatmentandAFSmeettherequirementsofdetection.KeywordsAtomicFluorescenceSpectrometry;Pretreatment;Watertreatmentagent;Polyaluminumchloride;Arsenic作者简介:吴惠刚,男,副主任技师,主要从事卫生检验工作。作者单位:广东省中山市疾病预防控制中心,528403水处理剂聚氯化铝属无机高分子混凝剂,国标采用的示性式为:Aln(OH)mCl(3n-m),0