CAJ | 학술논문

采用流动注射光度法对海水化学需氧量( CODMn ,高锰酸盐指数)进行快速测定。实验以KMnO4作氧化剂,淀粉-KI作显色剂,葡萄糖作标准物质；对流动注射分析流路进行了设计,优化了反应圈长度、反应温度、反应物浓度、进样量、泵速等实验条件；并通过自动加热装置对反应器进行在线加热；在最优条件下,测定方法的线性范围为0~6mg·L-1(实际需氧量),最低检出限为0．13mg·L-1,实际海水测定时加标回收率在96%~104%范围内,对1mg·L-1的COD标准溶液进行了11次连续测定,相对标准偏差( RSD)为1．88%。该方法操作简单、方便、灵敏度高,用于海水实际样品分析时,其测定值与国标法测定值一致。
채용류동주사광도법대해수화학수양량( CODMn ,고맹산염지수)진행쾌속측정。실험이KMnO4작양화제,정분-KI작현색제,포도당작표준물질；대류동주사분석류로진행료설계,우화료반응권장도、반응온도、반응물농도、진양량、빙속등실험조건；병통과자동가열장치대반응기진행재선가열；재최우조건하,측정방법적선성범위위0~6mg·L-1(실제수양량),최저검출한위0．13mg·L-1,실제해수측정시가표회수솔재96%~104%범위내,대1mg·L-1적COD표준용액진행료11차련속측정,상대표준편차( RSD)위1．88%。해방법조작간단、방편、령민도고,용우해수실제양품분석시,기측정치여국표법측정치일치。
The method of flow injection spectrophotometry is described for rapidly determining chemical oxygen demand(CODMn, permanganate index) in seawater. The method uses potassium permanganate as oxidant reagent,starch-KI as chromogenic agent and glucose as standard. The flow injection analysis flow is designed and is optimized by optimizing the experimental conditions which include the length of the reaction coil,reaction temperature,reactant concentration,sample size,pump speed,etc. And the reactor is on-line heating through an automatic heating device. Under the selected conditions,the calibration graph is linear within 0-6mg·L-1 (the actual oxygen demand)and the detection limit is 0. 13 mg·L-1. The recovery is between 96%and 104%when it is applied to the determination of the actual seawater and the relative standard deviation of the method is 1. 88%RSD(n=11)for the sample with 1mg·L-1 of COD. The method is simple and convenient operation,and high sensitivity,etc. and the measurement value of analyzer is the same as the result of standard method when used in seawater analysis of actual samples.