【名词&注释】
硝酸银(silver nitrate)、光电倍增管、原子荧光分析(atomic fluorescence analysis)、折光检测器(refractive index detector)、比色皿(colorimetric ware)、硼氢化钾(potassium borohydride)
[单选题]硼氢化钾(potassium borohydride)-硝酸银分光光度法测定水中痕量砷,当取水样体积为250ml,用10mm比色皿(colorimetric ware)时,该方法的最低检出浓度为()mg/L,测定上限为()mg/L.
A. 0.0001,0.004
B. 0.0002,0.008
C. 0.0003,0.0016
D. 0.0004,0.012