TABLE V

Accuracy (Recovery). Linearity of Recovery Data for Spiked N-nitrosamines: Endogenous, 100, and 300 ng/mL Levels were Performed in Triplicate, while the 200 ng/mL Level was Performed with Six Replicates (Repeatability). N-nitrosodiisopropylamine (Internal Standard) was Spiked at 100 ng/mL in Each Sample

Compound	100 ng/mL Spike % Recovery	% RSD	200 ng/mL Spike % Recovery	% RSD	300 ng/mL Spike % Recovery	% RSD	r² from Linearity of Recovery
Compound	(n = 3)	% RSD	(n = 6)	% RSD	(n = 3)	% RSD	r² from Linearity of Recovery
N-Nitrosodimethylamine	31.76	9.0	37.53	6.0	35.72	4.8	0.9954
N-Nitrosodiethylamine	78.13	18.5	70.20	5.8	73.74	0.6	0.9995
N-Nitrosomorpholine	65.44	15.3	61.60	3.3	63.56	2.3	0.9997
N-Nitrosopyrrolidine	74.27	16.6	63.61	7.7	68.67	0.9	0.9972
N-Nitrosopiperidine	86.80	19.8	80.71	4.6	81.58	2.9	0.9999
N-Nitrosodi-n-butylamine	94.14	20.6	82.87	4.5	90.51	2.2	0.9954

% RSD: Percent relative standard deviation. The % RSD was determined from three preparations, except for the 200 ng/mL, which was determined from six preparations.