流动注射异步注入-离子选择性电极法同时测定萝卜中的钾、钙、钠和氯  

Simultaneous Determination of K^+,Ca^(2+),Na^+ and Cl^- in Radish by Ion Selective Electrode Combined with Flow-Injection Asynchronous Injection

作　　者：王阿蓉[1] 李永生[1] 

机构地区：[1]四川大学化学工程学院,成都610065

出　　处：《理化检验（化学分册）》2016年第7期797-801,共5页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：建立了同时快速、准确测定萝卜中K^+、Ca^(2+)、Na^+和Cl^-的流动注射异步注入-离子选择性电极法。最佳试验条件为:系统流量为2.43mL·min^(-1);总离子强度调节缓冲液(TISAB)由80 mmol·L^(-1)Tris-硼酸(PH 6.00)、0.05 mmol·L^(-1)Na^+、0.5 mmol·L^(-1)K^+、0.01 mmol·L^(-1)Ca^(2+)和0.57mmol·L^(-1)Cl^-组成;反应盘管长度为50 cm;采样体积为220μL;混合标准溶液的pH为6.00。K^+、Ca^(2+)、Na^+和Cl^-的线性范围分别为10~70,0.5~7.0,10~36,21~119 mmol·L^(-1),检出限(3s/k)分别为5.0,0.2,5.0,10 mmol·L^(-1)。加标回收率在92.8%~110%之间,测定值的相对标准偏差(n=11)小于2.0%。A rapid and accurate method for simultaneous determination of K^＋ , Ca^2＋ , Na^＋ and Cl^- in radish was established by using ion selective electrode coupled with flow-injection asynchronous injection. The optimum conditions were as follows： the flow rate was 2.43 mL·L^-1; the total ion strength adjustment buffer consists of 80 mmol ·L^-1 of Tris-H3BO3（pH 6.00）, 0.05 mmol·L^-1 of Na^＋ , 0. 5 mmol·L^-1 of K^＋ , 0.01 mmol·L^-1 of Ca^2＋ and 0. 57 mmol ·L^-1 of Cl^-; the reaction coil length was 50 cm; the sampling volume was 220μL; the pH of the mixed standard solution was 6. 00. The linearity ranges of K^＋ , Ca^2＋ , Na^＋ and Cl^- were 10-70, 0. 5-7.0, 10-36, 21-119 mmol ·L^-1, respectively, with detection limits （3s/k） of 5. 0, 0. 2, 5.0, 10 mmol·L^-1, respectively. Recovery rates obtained by standard addition method were in the range of 92. 80%- 110% and RSD （n=11） was less than 2. 0 %.

关 键 词：离子选择电极法 流动注射 异步注入 K^+ Ca^2+ NA^+ Cl^- 萝卜 

分 类 号：O657.15[理学—分析化学]