Page 1. Monatshefte füur Chemie 135, 549–555 (2004) DOI 10.1007/s00706-003-0152-8 Synthesis of Partially Deuterated N-Nitrosamines – New Standards in Tobacco-smoke Analysis ... 552 P. Gärtner et al. Page 5. NaOH solution to pH¼ 6 and extracted with CH2Cl2. ...