问题
单项选择题
双硫腙-氯仿溶液在pH8.5～11.0提取铅时，为根除银的干扰，需加入（）
A.KCN
B.EDTA-2Na
C.柠檬酸盐
D.氟化物
E.酒石酸盐
答案
参考答案：A
解析：双硫腙-氯仿溶液在pH8.5～11.0提取铅时，加入氰化钾消除铜、锌、银、汞的干扰。
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双硫腙-氯仿溶液在pH8.5～11.0提取铅时，为根除银的干扰，需加入（）
A.KCN
B.EDTA-2Na
C.柠檬酸盐
D.氟化物
E.酒石酸盐
参考答案：A
解析：双硫腙-氯仿溶液在pH8.5～11.0提取铅时，加入氰化钾消除铜、锌、银、汞的干扰。
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| There is something about New Year's Eve. In Scotland the last day of the year is the 1 important holiday of the winter, 2 important than Christmas. On New Year's Eve friends and neighbours go about from house to house drinking to each other's health and wishing good luck. 3 New Year's Day all shops and factories are closed and no 4 is done. Families meet together for a big meal and a family 5 , They often sing and dance all the night. In England New Year's Day is not 6 holiday and people go to work as 7 But on New Year's Eve most people sit up till 8 "to see the new Year in" or they 9 to parties and dances. Most of the London hotels 10 a New Year's Eve dance. | ||||
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