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Evaluation of a modified cea instruments model 555 analyzer for the monitoring of formaldehyde vapor in domestic environments


, : Evaluation of a modified cea instruments model 555 analyzer for the monitoring of formaldehyde vapor in domestic environments. American Industrial Hygiene Association Journal 43(8): 547-552

Modifications were made to the experimental design, chemical reagents and operational protocol for a CEA Instruments Model 555 analyzer to optimize the performance of the instrument for formaldehyde (CH2O) monitoring. The improved sensitivity and reliability of the modified instrument enhanced its suitability for quasi-real-time monitoring of domestic environments with low CH2O concentration levels (0.01-0.2 ppm). Calibration data taken at sub-0.1 ppm CH2O levels yields a detection limit of .apprx. 0.01 ppm. The CH2O response of the instrument was insensitive to changes in humidity, but demonstrated a serious temperature dependence between 16.degree. and 38.degree. C. Calibration data taken at room temperature were applicable between 16.degree. and 28.degree. C if a specific operational protocol was observed. Field results taken in 3 dwellings with low CH2O concentration levels were reported. The performance of the modified CEA Instrument compared favorably with an environmentally controlled, reference, air-sampling unit.

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