Fluorescence determination of sub-parts-per-billion hydrogen sulfide in the atmosphere

Performance Characterization and Optimization of the AgNO3-Filter/FMA Fluorimetric Method for Atmospheric H2S Measurements

“…However, our results for standards prepared from Na2S are more in agreement with Axelrod et al 6 who stated a decay rate of 3 percent in 6 hours for diluted working Na2S standards. As noted by Karush et al, 4 extremely clean glassware is necessary for optimum performance of the method.…”

“…li5 ' 6 Additional reports describing the reactions of reduced sulfur species in aqueous solutions with either oxygen 12 or cyanide 13 also implied that these bisulfide solutions would be unstable with respect to long term storage.…”

“…Quantification is achieved by the selective quenching effects of sulfide [S"~2] (or more correctly bisulfide [HS~] since pK2 = 19 ± 2 for H2S( aq ) 3 ) on the fluorescence of fluorescein mercuric acetate (FMA). This fluorimetric procedure was initially described by Karush et al, 4 Grunert et al, 5 and Axelrod et al 6 The work described in this paper was performed as a portion of a more comprehensive evaluation of potential analytical techniques to measure natural emissions of volatile sulfur compounds. 7 The major objectives for the specific evaluation of the AgNCVfilter/FMA fluorimetric method were to: a) compare the responses of liquid sodium sulfide standards, which are normally used to calibrate the method, with gaseous H2S standards, which better simulate actual analyte and sample matrix components; b) clarify previous conflicting reports 1 ' 2 ' 8 concerning potential positive interferences from CH3SCH3 and CH3SH; c) assess the sources and magnitudes for both indeterminate and systematic errors in the sampling and fluorimetric procedures; and d) suggest modifications to the basic method and/or operational procedures that improve both analytical ruggedness and data quality.…”

Measurement of biogenic sulfur emissions from soils and vegetation: Application of dynamic enclosure methods with Natusch filter and GC/FPD analysis

“…Filters were analyzed following procedures similar to those given by Natusch et al ( ), Axelrod et al (1969, and Jaeschke and Herrman (1981). Each filter was leached with an alkaline cyanide solution, and an aliquot of the resulting mixture was combined with fluorescein mercuric acetate (FMA).…”

The use of thin silver films for the detection of low concentrations of hydrogen sulphide

“…An optical waveguide acid±vapour sensor has been shown to detect hydrogen sulphide although it is not speci®c for this gas and this is a serious drawback [12]. Fluorescence quenching has been demonstrated as a possible method for hydrogen sulphide sensing using thionine ®lms [13] and ®bre optic devices based on¯uorescein mercuric sulphate [14]. This latter method involves conversion of hydrogen sulphide gas to the hydrosulphide ion prior to reaction with the dye.…”