New bubbler design for atmospheric sampling

Axelrod, Herman D.; Wartburg, A. F.; Teck, Ronald J.; Lodge, James P.

doi:10.1021/ac60307a039

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…The determination of triphenylphosphine (TPP) in dilute solutions is generally difficult, especially where concentration or extraction of samples is undesirable or unfeasible. The most sensitive methods for tervalent phosphorus determination require that samples be oxidized exhaustively to orthophosphate, which can be analyzed color-¡metrically as a molybdate complex (1)(2)(3)(4). This oxidation procedure is laborious and it is not sufficiently sensitive to allow the detection of TPP at the ppm level.…”

Section: Resultsmentioning

confidence: 99%

Measurement of sub-ppb by volume levels of atmospheric nitrogen dioxide using an alkaline trapping solution and spectrofluorometric analysis

Axelrod¹,

Pickett²,

Engel³

1975

Anal. Chem.

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Section: Resultsmentioning

confidence: 99%

Measurement of sub-ppb by volume levels of atmospheric nitrogen dioxide using an alkaline trapping solution and spectrofluorometric analysis

Axelrod¹,

Pickett²,

Engel³

1975

Anal. Chem.

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“…The solutions used in the analysis are the following: sulfamic acid (H~NSOSH), 0.75% w/v in water; HCHO solution, 0.8 ml 38% HCHO diluted to 100 ml with water; PRA solution, 0.032 g pararosaniline hydrochloride and 48 ml 85% H3P04 diluted to 100 ml with water; 0.04M TCM solution, 0.04M HgC12, 0.08M NaCl (0.04M tetrachloromercurate(I1)). The 0.04M TCM was also used as a trapping solution for the bubbler apparatus (8).…”

Section: Methodsmentioning

confidence: 99%

“…A bubbler apparatus ( 8 ) was employed for comparing its efficiency in trapping SO1 to that of a filter. Thirteen ml of 0.04M TCM was placed in the bubbler and air passed through it at 2 1./ min.…”

Section: Methodsmentioning

confidence: 99%

Filter sampling method for atmospheric sulfur dioxide at background concentrations

Axelrod¹,

Hansen²

1975

Anal. Chem.

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0.2mM were stable and sufficiently concentrated to give quantitative results. The thiocyanate concentration was found to be important in driving the reaction to completion and affected the rate of complex formation. Low absorbances observed at concentrations less than about 0.2M might, in part, result from the decomposition of I(SCN)zto form the non-absorbing ISCN (IO).Hydrogen ion concentrations were about 1M in all cases.Lower concentrations caused a slight decrease in stability and higher concentrations (above 2-3M) led to the decomposition of thiocyanic acid (9).Absorbance measurements on thirty separately prepared solutions are shown in Table I. Precision of replicate measurements is good and the overall accuracy has a range of about f3%. A linear least squares fit to the data gives a slope of 41100 f 200 1. mol-' cm-l and a y-intercept of Possible interferences from extraneous ions were examined. Table I1 summarizes these observations. In each case, two solutions of identical iodide concentrations were compared with an extraneous ion added to one. These were carried through the procedure in parallel.Clearly, chloride presents no serious interference at the levels examined and bromide lowers the absorbance only a few percent. The fact that the chloride interference does not change with chloride concentration suggests that the 2% difference in absorbance may be a measurement error rather than an interference. Sulfate, a frequent interference in iodide analyses, causes a small decrease in absorbance.The transition metal ions interfered to varying extents. Since thiocyanate complexes form with these cations, interferences are to be expected.-0.003.

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Use of gold tracer in the study of atmospheric oxidation of sulfur dioxide

et al. 1982

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A technique using gold particles as a conserved tracer has been developed in an effort to determine experimentally the oxidation of sulfur dioxide in sour gas plant plumes. A helicopter was used for plume sampling at distances up to 4 km downwind of the stack. The concentration of sulfur dioxide gas in the plume sample was determined by the West‐Gaeke method. Neutron activation analysis was used to determine the concentration of gold particles in the plume sample. Since gold particles do not react chemically with plume gases, any decrease in their concentration along the plume path was due to turbulent dispersion. This parameter allowed an accurate estimation to be made of the decrease in the sulfur dioxide concentration within the plume sample that had occured due to physical dilution alone. Any further decrease in concentration could therefore be attributed to loss by chemical reaction. The experimental results indicated that, within the range studied, there is no measurable oxidation of sulfur dioxide in sour gas plant plumes.

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New bubbler design for atmospheric sampling

Cited by 6 publications

References 2 publications

Measurement of sub-ppb by volume levels of atmospheric nitrogen dioxide using an alkaline trapping solution and spectrofluorometric analysis

Measurement of sub-ppb by volume levels of atmospheric nitrogen dioxide using an alkaline trapping solution and spectrofluorometric analysis

Filter sampling method for atmospheric sulfur dioxide at background concentrations

Use of gold tracer in the study of atmospheric oxidation of sulfur dioxide

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