云南化工
雲南化工
운남화공
YUNNAN CHEMICAL TECHNOLOGY
2012年
2期
26-28
,共3页
计时电位溶出法%砷%天麻
計時電位溶齣法%砷%天痳
계시전위용출법%신%천마
chronopotentiometric stripping analysis%arsenic%gastrodia
以镀金玻碳电极为工作电极,计时电位溶出法测定天麻中的痕量砷。选择富集电位为-0.45V,溶出低液为3.0 mol/L的硝酸,在＋0.14V电位处获得一灵敏的砷（Ⅲ）的二次微分电位溶出峰,且该溶出峰的峰高与砷的质量浓度在2.0～12.0μg/L范围内呈线性关系,方法的检出限（3S/N）为0.96μg/L。方法用于测定天麻中痕量砷的回收率为97.6%～102.4%,RSD为2.7%～3.1%。
以鍍金玻碳電極為工作電極,計時電位溶齣法測定天痳中的痕量砷。選擇富集電位為-0.45V,溶齣低液為3.0 mol/L的硝痠,在＋0.14V電位處穫得一靈敏的砷（Ⅲ）的二次微分電位溶齣峰,且該溶齣峰的峰高與砷的質量濃度在2.0～12.0μg/L範圍內呈線性關繫,方法的檢齣限（3S/N）為0.96μg/L。方法用于測定天痳中痕量砷的迴收率為97.6%～102.4%,RSD為2.7%～3.1%。
이도금파탄전겁위공작전겁,계시전위용출법측정천마중적흔량신。선택부집전위위-0.45V,용출저액위3.0 mol/L적초산,재＋0.14V전위처획득일령민적신（Ⅲ）적이차미분전위용출봉,차해용출봉적봉고여신적질량농도재2.0～12.0μg/L범위내정선성관계,방법적검출한（3S/N）위0.96μg/L。방법용우측정천마중흔량신적회수솔위97.6%～102.4%,RSD위2.7%～3.1%。
A method for the determination of arsenic in Gastrodia by chronopotentiometric stripping analysis was proposed with gold-plated glassy carbon electrode as working electrode.A sensitive ondary differential potentiometric stripping peak of As（Ⅲ） was obtained at the potential of ＋0.14V,when accumulation potential taken was-0.45V and 3.0 mol/L HNO3 was used as base solution.Linear relationship between values of the peak height and mass concentration of arsenic were kept in the range of 2.0~12.0 μg/L.Detection limit（3S/N） of the method was found as 0.96 μg/L.The proposed method was used in the analysis of sample of gastrodia,giving values of recovery in the range from 97.6% to 102.4%,with RSD in the range of 2.7%~3.1%.
