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

Table 8

Evaluation of the chromatographic peak area of Medemo and di-n-amylether at m/z 71 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
	Medemo	Diamyl-ether	Medemo	Diamyl-ether	Medemo	Diamyl-ether
Retention time (min)	18.4	12.4	14.6	9.5	19.2	13.2
Linearity range (mg/L)	10–40	5–40	2.5–12	2.5–12	15–50	10–50
R	0.9988	0.9997	0.9997	0.9968	0.9995	0.9998
QC	2.58	1.77	0.81	4.01	1.68	0.79
Gradient (A × 10^−6 × L/mg)	0.53	2.5	0.11	0.49	0.017	0.084
Intercept (A × 10^−6)	−0.10	−1.3	−0.014	−0.0034	−0.0089	−0.00095
Response factor FR	0.21		0.22		0.20
Average value of FR			0.21