damoguyan
第8楼2011/04/08
用微波多消解几遍,不要看消解清了(眼看澄清不算,继续消解几遍)
我用一个比较差的微波一次消解眼看是澄清的,但测试结果老是20-60ppmCR(很多次都这样)
后来消解2遍,得到CR108PPM,有时间大家也多消解几次试试。。。。
EC681K证书中有以下说明,CR的值在20-80之间也是正常的:
Additional Material Information | |
Mass Fraction 1 [mg/kg] | |
Acid digestible Cr | 2.9 – 16.2 |
1) Range of results obtained by conventional acid digestion of the material in 9 laboratories. The value of the amount of acid digestible Cr depends on the sample intake as well as on digestion conditions (acid mix, temperature, pressure). |
依风1986
第9楼2014/12/10
Additional Material Information | |
MassFraction1 [mg/kg] | |
Acid digestible Cr | 2.9 – 16.2 |
1) Range of results obtained by conventional acid digestion of the material in 9 laboratories. The value of the amount of acid digestible Cr depends on the sample intake as well as on digestion conditions (acid mix, temperature, pressure). |