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专业: 食品加工技术

[求助] 欧药典：重金属的测定方法C中疑问之处，欢迎解答。已有1人参与

前辈们好：
小弟所在公司想用欧洲药典进行重金属测定，其中有一段话为：
Reference solution (standard). Prepare as described for the
test solution, using the prescribed volume of lead standard
solution (10 ppm Pb) R instead of the substance to be
examined. To 10 ml of the solution obtained add 2 ml of the
test solution.
Monitor solution. Prepare as described for the test solution,
adding to the substance to be examined the volume of lead
standard solution (10 ppm Pb) R prescribed for preparation
of the reference solution. To 10 ml of the solution obtained
add 2 ml of the test solution.
小弟不明白为什么标中还需要每10毫升需要加2毫升的样品？然后这个MONITOR 中也加2毫升的样品，这是为什么啊？

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