摘要
报道了以氨三乙酸为活化剂,以N-十二烷基二甲基铵基乙酸(DDMAA)为增敏剂,高碘酸钾氧化天青(Ⅱ)催化光度法测定痕量锰的新方法.本法在两性表面活性剂DDMAA存在下,灵敏度提高了3.3倍(锰量为 0.4～2.0 μg/L)和 5.6倍(锰量为2.0～6.0μg/L);相对标准偏差为1.3%(n=11),方法的检出限为5.2×10^(-11)g/mL.可用于茶叶中锰的测定.
A new catalytic spectrophotometric method for the determination of trace Mn ( Ⅱ ) was developed. The method was based on the oxidation of azure ( Ⅱ) with potassium periodate in the presence of nitrilotriacetic acid as an activator and dodecyl dimethylamino acetic acid (DDMAA) as a sensitizer. The sensitivity is increased by 3.3 times (the range of 0.4 - 2.0 μg/L) and 5.6 times (the range of 2 -6.0 μg/L) than that in the absence of the DDMAA. The relative standard deviation was 1.3 % for 2.4 μg/L Mn( Ⅱ ) (11 replicates) . The limit of detection for Mn was 5.2 × 10-11 mg/L. The method has been used to determine Mn in tea sample.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1999年第3期350-353,共4页
Chinese Journal of Analytical Chemistry
关键词
催化光度法
增敏剂
天青
痕量
锰
DDMAA
测定
Catalytic spectrophotometry, dodecyl dimethylamino acetic acid, azure(II) , manganese
