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【单选题】
用原子吸收光度法测定镉含量,称含镉试样0 2500g,经处理溶解后,移入250mL容量瓶,稀释至刻度,取10.00mL,.定 25.00mL. 测得吸光度值为 0.3 0 ,已知取10.00mL 浓度 0.5vg/ mL. 的液,定 25.00mL 后,测得其吸光度为 0.25. 则待测样品中的铬含量为 ( ) 。
A.
0.5%
B.
0.06%
C.
0.05%
D.
0.20%
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