应用化工
應用化工
응용화공
APPLIED CHEMICAL INDUSTRY
2014年
9期
1734-1736,1739
,共4页
微波消解%茶叶%分光光度法%铜%DDTC钠盐
微波消解%茶葉%分光光度法%銅%DDTC鈉鹽
미파소해%다협%분광광도법%동%DDTC납염
microwave assisted digestion%tea%spectrophotometry%copper%sodium diethyl dithiocarbamate
采用微波消解法预处理茶叶样品，利用二乙基二硫代氨基甲酸钠（ DDTC）分光光度法测定其中铜的含量，确定了最大吸收波长、显色剂用量、显色时间、pH 值、消解工艺和掩蔽剂等条件，和干法灰化法测定的结果进行对比，本方法具有灵敏度高、精密度好、耗时少、操作简单等优点，相对标准偏差（n =6）在2.2%~5.1%，加标回收率在98.6%~101.3%，结果满意。
採用微波消解法預處理茶葉樣品，利用二乙基二硫代氨基甲痠鈉（ DDTC）分光光度法測定其中銅的含量，確定瞭最大吸收波長、顯色劑用量、顯色時間、pH 值、消解工藝和掩蔽劑等條件，和榦法灰化法測定的結果進行對比，本方法具有靈敏度高、精密度好、耗時少、操作簡單等優點，相對標準偏差（n =6）在2.2%~5.1%，加標迴收率在98.6%~101.3%，結果滿意。
채용미파소해법예처리다협양품，이용이을기이류대안기갑산납（ DDTC）분광광도법측정기중동적함량，학정료최대흡수파장、현색제용량、현색시간、pH 치、소해공예화엄폐제등조건，화간법회화법측정적결과진행대비，본방법구유령민도고、정밀도호、모시소、조작간단등우점，상대표준편차（n =6）재2.2%~5.1%，가표회수솔재98.6%~101.3%，결과만의。
Samples of tea-leaves were digested by microwave assisted digestion,and trace copper in the so-lutions were determined by spectrophotometry with sodium diethyl dithiocarbamate. The effects of the max-imum absorption wavelength,the volume of chromogenic reagent,reaction time,pH value,digestion proce-dure and masking agents were studied. Compared with the method of dry ashing,the established method has good sensitivity and precision,less time-consuming and simple operation. Under the optimum condi-tions,values of RSD’s(n = 6)of were found in the range of 2. 2% ~ 5. 1% ,and values of recovery were found in the range of 98. 6% ~ 101. 3% . The proposed method was used in the local tea-leaves with satis-factory results.
