The Lead Dioxide Estimation Of Sulfur Dioxide Pollution

SO2 in Beirut: air quality implication and effects of local emissions and long-range transport

“…This method cannot be used for short-term SO 2 monitoring, such as several hours. The method was improved by using an inverted Petri dish that held a glass fiber filter covered with a lead peroxide layer (Huey 1968). Other absorbents were used for the passive sampling of SO 2 like tetrachloromercurate solution, potassium carbonate.…”

Identification and Quantitative Analysis of Particulate Air Contaminants by X-Ray Diffraction Spectrometry

“…Since surface reaction chemistry provides the basis for several standard methods employed by air pollution control agencies to monitor levels of ambient gaseous contaminants, 7 an investigation was made to determine the suitability of x-ray diffraction as a means for direct measurement of the lead sulfate formed on lead peroxide sulfation plates prepared according to the method of Huey. 4 Here, although relatively high levels of SO2 (1 ppm) produced detectable amounts of PbSO 4 by x-ray diffractometry upon one week s exposure, little evidence of sulfation was observed by diffraction on plates exposed to ambient SO2 although, chemical analysis of adjacent plates similarly exposed showed average sulfation levels of 1.1 mg/100 cm 2 . …”

“…As a result of this study, an attempt was made to evaluate the effectiveness of x-ray diffraction as a means for determining the sulfation index of ambient SO2 using direct correlation of the line intensities of surface layer lead sulfate formed on exposure of PbO 2 to ambient SO2 according to the method of Huey,4 but without recourse to chemical separation of unreacted lead peroxide.…”

Evaluation of the Effectiveness of The Lead Peroxide Method for Atmospheric Monitoring of Sulfur Dioxide

“…Consequently, ambient SO2 concentration is often monitored by the much simpler ASTM standard lead peroxide method (ASTM Designation: D2010-65). 1 In this method, a coating of gel containing lead peroxide is applied either to the surface of a plate (Huey plate) 2 or to a fabric binder on a cylindrical support (lead peroxide candle). The reactive surface is then exposed to the atmosphere for a period of time, generally four weeks for the lead peroxide candle and much shorter for the Huey plate.…”

“…At the end of the time period, the degree of sulfation, expressed as mg SO 3 /100 cm 2 /day, is determined by the gravimetric or turbidimetric barium sulfate procedure. 2 The mean atmospheric SO 2 concentration is then calculated by. multiplying an empirical correlation factor to the amount of SO 2 fixation.…”