Amethodforsimultaneousdeterminationofharmfultraceelementsinun-plasticizedpolyvinylchloride(PVC-U)pipesbyinductivelycoupledplasmaatomicemissionspectrometry(ICP-AES)wasstudied.Undertheoptimumcondition,themethodofsimultaneousdeterminationoftraceelementsinPVC-UpopessuchasCd,Pd,SnandHgbyinductivelycoupledplasmaatomicemissionspectrometrywasestablished.Thedetectionforelementsare0.007-0.17g/ml.Therecoveriesare95.12%--106.00%.Therelativestandarddeviationare1.5%--2.9%.Thismethodisaccurate,rapidandconvenientwithsatisfactoryresults.
1.总结说明其中用到的时态2.找出其中的逻辑语法词,并说明每个词的含义3.找出抽象名词,并指出其原型(vorn)及相关的汉语意思4.找出被动语态,非谓语,情态动词