21.7
[1]. N C Jain, et al. Simultaneous determination of cocaine and benzoyl ecgonine in urine by gas chromatography with on-column alkylation. J Forensic Sci. 1977 Jan;22(1):7-16.
P21-P7+P78
GHS2
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质量 (g) = 浓度 (mol/L) × 体积 (L) × (g/mol)