有没有做过标准DB44/814-2010,DB44/815-2010,DB44/816-2010附录D——
气相色谱法测定废气的挥发性有机化合物的,对其中的"对未识别峰,可以以甲苯计"不太明白,主要有两点,恳请指教.
1.计算样品未识别组分浓度时,样品未识别组分的量要减去空白管的未识别组分的量吗?
2.计算样品未识别组分浓度时,也要除以甲苯的回收率吗?
标准中的计算公式:
![](data:image/png;base64,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)
式中:Cc——标准状态下某种挥发性有机物的浓度,mg/m
3;
m
i——样品管中i组分的量,μg;
m
0——未采样管(空白管)中i组分的量,μg;
V
nd——标准状态下采样体积,L;
R——回收率