Internal Standards for Quantitative Analysis of Chemical Warfare Agents by the GC/MS Method: Nerve Agents

Table 4

Evaluation of the chromatographic peak area of soman and triethylphosphate at m/z 99 as a linear function of their concentration (critical values of the correlation coefficient R_CRIT 0.99 and QC coefficient QC_CRIT 5.00).

GC/MS compound	7890A/5975C		Intuvo 9000/5977B		EM 640
	Soman	Triethyl-phosphate	Soman	Triethyl-phosphate	Soman	Triethyl-phosphate
Retention time (min)	11.7	13.2	10.3	11.7	11.6	13.3
Linearity range (mg/L)	2.5–20	2.5–40	1–15	0.5–15	5–40	5–50
R	0.9971	0.9985	0.9991	0.9989	0.9988	0.9978
QC	4.32	3.63	3.07	3.76	3.16	4.79
Gradient (A × 10^−6 × L/mg)	1.6	1.4	0.45	0.39	0.024	0.021
Intercept (A × 10^−6)	−0.65	−0.34	−0.030	−0.019	−0.0019	0.010
Response factor FR	1.10		1.16		1.16
Average value of FR	1.14