CAJ | 학술논문

应用氢化物发生原子荧光光谱法（HG －AFS）测定钨矿石和钼矿石中的砷，钨钼铜铅锌铋镉等共存元素在不经分离或不加掩蔽剂的情况下对砷测定产生严重干扰。本文采用盐酸－硝酸（5∶1）水浴加热分解样品，加入柠檬酸－碘化钾掩蔽共存元素，促进这些元素还原成低价离子或者直接形成沉淀以消除干扰；再加入硫脲－抗坏血酸还原后直接用 HG －AFS 测定砷量。砷的检出限为0．014μg／g，测定范围为0．2～2000μg／g，方法精密度为0．7％～7．5％，加标回收率为92．3％～102．9％。本方法与国家标准方法相比，检出限低，检测范围宽，干扰元素不经分离可直接测定砷的含量。
응용경화물발생원자형광광보법（HG －AFS）측정오광석화목광석중적신，오목동연자필력등공존원소재불경분리혹불가엄폐제적정황하대신측정산생엄중간우。본문채용염산－초산（5∶1）수욕가열분해양품，가입저몽산－전화갑엄폐공존원소，촉진저사원소환원성저개리자혹자직접형성침정이소제간우；재가입류뇨－항배혈산환원후직접용 HG －AFS 측정신량。신적검출한위0．014μg／g，측정범위위0．2～2000μg／g，방법정밀도위0．7％～7．5％，가표회수솔위92．3％～102．9％。본방법여국가표준방법상비，검출한저，검측범위관，간우원소불경분리가직접측정신적함량。
Determining arsenic in tungsten and molybdenum ores using Hydride Generation-Atomic Fluorescence Spectrometry (HG-AFS )without separation and a screening agent commonly suffer from the interferences of associated elements such as W,Mo,Cu,Pb,Zn,Bi and Cd.In this study,the samples were digested by hydrochloric acid-nitric acid (volume ratio of 5 ∶1 )in a water bath.Citric acid and potassium iodide solution were used to screen interferences of associated elements by reducing these elements to low valences or forming the precipitates.Lastly thiourea-ascorbic acid solution was added and As content was determined directly by HG-AFS. The method yields an As detection limit of 0.014 μg/g,precision of 0.7% -7.5%,and recovery of 92.3% -102.9%.Compared to the national standard method,this method has the advantages of low detection limit,wide detection ranges,and direct determination without separating interference elements.