原文由 shoen0739(shoen0739) 发表:
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
仪器单次进样时,1ppm几乎是平峰, 浓度过大会损害仪器的。