【名词&注释】
季节性变化(seasonal variation)、间隔时间(interval time)、比色皿(colorimetric ware)
[单选题]二乙基二硫代氨基甲酸银分光光度法测定水中砷,当试取最大体积50ml、用10mm比色皿时,可检测水中砷的上限浓度为()mg/L,最低检出浓度为()mg/L.
A. 0.10,0.001 B. 0.30,0.003 C. 0.50,0.007 D. 0.07,0.005