为了探讨溶解氧电解法测定BOD(mg/L)的可行性,将同一水样分发给15个实验室,进行协同实验,其结果如下:51.20,53.12,53.40,53.52,53.56,53.74,53.90,54.12,54.20,54.36,54.40,54.78,54.96,55.26,56.02。
51.20和56.02相对于其他值为可疑数据,是否可舍弃这两个数据?(试用Grubbs检验法,α=0.01)
)间接碘量法测定铜时,若试液中有Fe3+;AsO43-,它们都可将碘离子氧化成碘单质,加入NH4HF2可消除两者的干扰,解释其中原因。