['PROJECT', 'NUMBER:', '1752', 'DATE:', 'November', '1,', '1983', 'PROJECT', 'TITLE:', 'Cigarette', 'Smoke', 'Studies', 'PROJECT', 'LEADER:', 'Gunars', 'Vilcins', 'PERIOD', 'COVERED:', 'October,', '1983', 'AMMONIA', 'IN', 'CIGARETTE', 'SMOKE', 'A.', 'Precision', 'Studies', 'The', 'tunable', 'diode', 'laser', '(TDL)', 'measurements', 'of', 'ammonia', 'in', 'cigarette', 'smoke', 'have', 'been', 'investigated', 'further', 'this', 'month.', 'At', 'this', 'time', 'the', 'precision', 'of', 'the', 'ammonia', 'in', 'smoke', 'measurements', 'is', '+15%', 'over', 'the', 'ammonia', 'concentration', 'range', 'of', '0.4', 'micrograms', 'per', 'cigarette', 'to', '400', 'micrograms', 'per', 'cigarette,', 'Part', 'of', 'this', 'variation', 'is', 'caused', 'by', 'the', 'variability', 'of', 'cigarettes.', 'Another', 'source', 'of', 'variation', 'is', 'the', 'impaction', 'trap', 'used', 'to', 'remove', 'the', 'particulate', 'matter.', 'A', 'new', 'method', 'of', 'flow', 'control', 'will', 'be', 'used', 'to', 'improve', 'the', 'precision.', 'B.', 'Linearity', 'Studies', 'Experiments', 'were', 'performed', 'which', 'demonstrated', 'that', 'for', 'a', 'path-length', 'of', '"4', 'meters', 'and', 'using', 'a', 'relatively', 'weak', 'absorption', 'line,', 'the', 'quantitation', 'of', 'ammonia', 'in', 'mainstream', 'smoke', 'is', 'linear', 'up', 'to', '65', 'micrograms', 'per', 'puff.', 'This', 'covers', 'the', 'range', 'of', 'most', 'of', 'the', 'cigarettes', 'investigated', 'to', 'date.', 'C.', 'Data', 'Treatment', 'A', 'non-linear', 'least', 'squares', 'fitting', 'program', 'has', 'been', 'written', 'and', 'debugged', 'that', 'fits', 'an', 'arbitrary', 'function', 'to', 'the', 'experimental', 'data.', 'This', 'program', 'has', 'been', 'used', 'to', 'determine', 'the', 'reproducibility', 'of', 'ammonia', 'standards', 'using', 'the', 'TDL', 'system.', 'The', 'reproduciblity', 'was', 'improved', 'by', 'a', 'factor', 'of', 'two', 'using', 'this', 'program', 'to', 'better', 'than', '+0.4%', 'for', '.28', 'micrograms', 'per', 'puff.', 'This', 'program', 'will', 'be', 'used', 'to', 'determine', 'if', 'the', 'precision', 'of', 'the', 'ammonia', 'measurements', 'in', 'smoke', 'determinations', 'can', 'be', 'improved.', "'", 'The', 'ammonia', 'data', 'collection', 'routines', 'have', 'been', 'modified', 'and', 'debugged', 'to', 'permit', 'the', 'measurements', 'of', 'ammonia', 'in', 'mainstream', 'and', 'sidestream', 'simultaneously.', 'D.', 'Ammonia', 'in', 'National', 'POL-3250', 'Cigarettes', 'The', 'control', 'Y-84-1', 'Marlboro', '85', 'type', 'cigarettes', 'with', 'RL-TC', 'substituted', 'for', 'all', 'Recon', 'delivered', '1.8', 'micrograms', 'of', 'ammonia', 'per', 'cigarette.', 'The', 'experimental', 'Y-84-1', 'type', 'cigarette', 'with', 'RCB', 'substituted', 'for', 'all', 'Recon', 'delivered', '5.9', 'micrograms', 'of', 'ammonia', 'per', 'cigarette.', 'The', 'puff', 'by', 'puff', 'information', 'clearly', 'shows', 'that', 'the', 'experi-', 'mental', 'cigarette', 'delivers', 'increasing', 'amounts', 'of', 'ammonia', 'with', 'increasing', 'puff', 'number', 'while', 'the', 'control', 'shows', 'a', 'much', 'less', 'dramatic', 'trend.', '6GLSLYESGOT']