caa a22 4500 467905088 CHVBK 20180406152831.0 cr unu---uuuuu 170328e20060901xx s 000 0 eng 10.1007/s10661-005-9073-9 doi (NATIONALLICENCE)springer-10.1007/s10661-005-9073-9 GOYAL S. National Environmental Engineering Research Institute (NEERI), Nehru Marg, 440 020, Nagpur, India aut Effect Of Reagent (Dye) Addition In Wet Chemical Method Of Sulfur Dioxide Determination In Ambient Air [Elektronische Daten] [S. GOYAL] For measurement of sulfur dioxide (SO2) in ambient air, the United States Environment Protection Agency (US EPA) had recommended the PRA dye-based colorimetric method as a reference technique. The method has been developed and applied in many countries for a longtime; however information regarding the sensitivity of the method with respect to sampling and analysis conditions is not available. Collaborative studies conducted in some of the South East Asian countries indicated substantial variations (of the order of 50%) in the measured concentrations against the true values. It was observed that dye used for color development plays an important role and even a slight variation in the way the dye solution is prepared can cause substantial variation in the measured SO2 concentration. Because a major objective of air quality measurements is to relate air pollution concentration to the effects of air pollution, it is important that the method used should yield accurate levels of the pollutant, so that appropriate management plans can be devised and implemented effectively. In the present investigation, therefore, the role of dye used in SO2 monitoring method has been highlighted. Different makes of dyes prepared in different modes were used to study the variation in the measured SO2 concentration levels. Specifications of all the dyes were also tested. Need for use of certified reference material (CRM) for SO2 has also been emphasized. Springer Science + Business Media, Inc., 2006 SO2 nationallicence para-rosaniline method nationallicence precision nationallicence accuracy nationallicence calibration curve nationallicence CRM nationallicence AU : Absorbance unit nationallicence CRM : Certified reference material nationallicence DSM : Dichloro-sulfitomercurate nationallicence H3PO4 : Phosphoric acid nationallicence HCHO : Formaldehyde nationallicence HCl : Hydrochloric acid nationallicence MBS : Sodium meta-bisulfite nationallicence PRA : Para-rosaniline hydrochloride (dye) nationallicence RA : Rosaniline hydrochloride (dye) nationallicence SDFC : S.D. Fine Chemicals (Manufacturer) nationallicence SO2 : Sulfur dioxide nationallicence TCM : Potassium tetrachloro-mercurate nationallicence μg m−3 : microgram per meter cube nationallicence WHO : World Health Organization nationallicence Environmental Monitoring and Assessment Kluwer Academic Publishers 120/1-3(2006-09-01), 461-476 0167-6369 120:1-3<461 2006 120 10661 https://doi.org/10.1007/s10661-005-9073-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10661-005-9073-9 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- GOYAL S. National Environmental Engineering Research Institute (NEERI), Nehru Marg, 440 020, Nagpur, India aut NATIONALLICENCE 773 0- Environmental Monitoring and Assessment Kluwer Academic Publishers 120/1-3(2006-09-01), 461-476 0167-6369 120:1-3<461 2006 120 10661 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer