小中大为什么不能测PPM?
仪器厂家的灵敏度参数都是标的 ppm的cps啊 如下:
<高灵敏度模式> 9Be > 50 Mc/s/mg/L Li (7)>50 Mcps/ppm Li (7)>40, 50, 80 kcps/ppb
115In > 1000 Mc/s/mg/L Co (59)>30 Mcps/ppm (cool plasma, 7700s) Co (59)>60, 100, 200kcps/ppb
232Th > 500 Mc/s/mg/L Y (89)>240(7700s) Mcps/ppm In (115)>150, 220, 400kcps/ppb
Ti (205)>120(7700s) Mcps/ppm U (238)>200, 300, 500kcps/ppb
CeO+/Ce+ < 3% CeO+/Ce+ < 3%(7700s) CeO+/Ce+ < 2%
Ba++/Ba+ <3% Ce++/Ce+ <6%(7700s) Ba++/Ba+ <3%
Ce++/Ce+ <2%
所以ppm完全没问题。
再说一般的ICPMS的检测器的线性范围都是 10的9次方 啊