【摘要】 提出了用偏振能量色散-X射线荧光光谱法（XRFS）对塑料中REACH法规所高度关注的物质进行筛选。将塑料样品粉碎至直径小于2 mm的颗粒并置于模具中热压（250℃,30 min）成紧密的片块固体用于XRFS分析。在所选定的仪器工作条件下对样品中的铬、溴、铅、砷、锡及氯等6种元素进行了测定。测得其检出限(mg·kg^-1)为:0.5（氯、砷）,1.0（铬、铅）,2.0（溴）和3.0（锡）。各元素测定值的相对标准偏差（n=12）在0.19%～7.2%范围内。应用此方法分析2个标准物质（EC680k及EC681k）,6种元素的测定值与认定值一致。根据上述6种元素的测定值,用相应的换算系数计算出REACH法规所关注的7种物质（即六溴环十二烷、双三丁基氧化锡、五氧化二砷、三氧化二砷、三乙基砷酸酯、砷酸氢铅及重铬酸钠）的含量并进行了评估。更多还原

【Abstract】 Polarized energy dispersive X-ray fluorescence spectrometry was applied to the screening of the substances highly concerned by REACH regulations in plastics.The sample was crushed to granules of diameters less than 2 mm,and pressed into solid and dense flake in a mould at 250 C for 30 min which was used for XRFS analysis.Six elements,i.e.,Cr,Br,Pb,As,Sn and CI.in the sample were determined under the optimized working conditions of the instrument.Values of detection limit found were(in mg ? kg^-1):0.5（for CI and As）, 1.0（for Cr and Pb）,2.0（for Br） and 3.0（for Sn）.Values of RSD’s（n=12） for the elements found were in the range of 0.19%-7.2%.Two CRM’s（EC680k and EC681k） were analyzed by the present method,giving results in consistency with the certified values.Based on the contents of the 6 elements found,amounts of the 7 substances highly concerned by REACH regulations,i.e..hexabromocyclododecane,bis（tributyl-tin） oxide,arsenic oxide, arsenous oxide,triethyl arsenate,lead hydrogen arsenate and sodium dichromate,were calculated by the conversion factors.更多还原