资源描述：
《氢化物- 原子荧光法测定土壤硒含量的样品处理研究》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、安徽农业科学,JournalofAnhuiAgri.Sci.2008,36(34):14843-14845责任编辑理雪莲责任校对张士敏氢化物-原子荧光法测定土壤硒含量的样品处理研究鲁绪会,王浩东,周云,李敏(安康学院化学化工系,陕西安康725000)摘要[目的]为农业部门土壤硒资源调查提供科学依据。[方法]分别从样品处理中的混酸比例、冷消解时间、低温消解温度和超声波超声时间4个影响因素比较氢化物-原子荧光测定土壤中硒含量的效果。[结果]用混酸比(硝酸+高氯酸)为(2∶3)对样品冷处理硒的提取效果最好;土壤样品冷
2、消解48h后,高温160℃处理的样品中硒的提取率最高;加混酸冷处理32h以后硒的提取率较高;土样加混酸后通过超声20min直接低温处理,可以大大提高样品的处理效率。[结论]样品称量后直接加混酸经20.00min超声,在160℃的砂浴上加热,硒的提取效果很好,是一种很好的适合氢化物-原子荧光法测定壤中硒含量的土样处理方法。关键词原子荧光法;硒;样品处理;提取率中图分类号S151.9文献标识码A文章编号0517-6611(2008)34-14843-03ResearchonSoilSampleTreatmentfo
3、rDetectionofSeleniumContentbyUsingHydrideAtomicFluorometrySpectrometryLUXu-huietal(DepartmentofChemistryandEngineering,AnkangUniversity,Ankang,Shaanxi725000)Abstract[Objective]Theaimwastoprovidethescientificbasisfortheagriculturalsectorsurveyonseleniumresour
4、ceinthesoil.[Method]Theeffectofusinghydride-atomicfluorometryspectrometrytodetecttheseleniumcontentinthesoilwerecomparedfromthe4effectingfactorsoftheproportionofmixedacids,colddigestiontime,thetemperatureoflowtemperaturedigestionandtheultrasonictimeofultraso
5、nicinthesampletreatment,resp.[Re-sult]Theextractioneffectofseleniumwasbestbyusingtheproportionofnitricacidandperchloricacidof2∶3totreatthesamplecoldly.Theextractionrateofseleniuminthesampletreatedwithhightemperatureat160℃aftercolddigestionfor48hwashighest.Th
6、eextractionrateofseleniumaftercoldtreatmentwiththemixedacidsfor32hwashigher.Thesoilsamplesmixedwiththemixedacidsandthentreatedwithlowtemperaturedirectlyafterultra-sonicprocessfor20mincouldincreasethetreatmentefficiencyofsampleslargely.[Conclusion]Theselenium
7、couldgetgoodextractioneffectinthemethodasthattheweighedsamplewasaddedbymixedacidsdirectly,madebyultrasonicprocessfor20min,andthenheatedat160℃insand,whichwasagoodsampletreatmentmethodsuitableforusinghydride-atomicfluorometryspectrometrytodetecttheseleniumcont
8、entinthesoil.KeywordsAtom-fluorescence;Selenium;Sampletreatment;Extractionrate[1]硒是人类必需的微量元素之一。人体硒的摄取来源1000ml备用,使用时逐级稀释。硼氢化钾溶液:称取15.0g主要是人类赖以生存的土壤上生长的农副产品,所以土壤含硼氢化钾,溶于0.5%氢氧化钾溶液中,然后定容至1000ml,硒量的
