Limitations of the Lead Acetate Impregnated Paper Tape Method for Hydrogen Sulfide

Modifications to an H2S Tape Sampler for Increasing Sensitivity and Accuracy in H2S Sampling

“…When the same experiment was performed with the RAC pre-humidifier, the result was 55% RH in the exit air. It is a well known fact that humidity is necessary for spot formation, 3 and has been verified in our laboratory.…”

Exoenzymes and metabolites related to the nematicidal effect of rhizobacteria on Xiphinema index Thorne & Allen

“…Nevertheless, the colour of the precipitated lead sulphide spots fades due to the action of light, sulphur dioxide or other substances that are capable of oxidizing lead sulphide (Sanderson et al . ). Therefore, the results had to be recorded shortly after opening the plates.…”

“…The method that uses lead acetate paper tape allowed for detecting the strains that liberate H 2 S because the metal precipitates as lead sulphide and changes the paper colour from yellow, passing through grey to black. Nevertheless, the colour of the precipitated lead sulphide spots fades due to the action of light, sulphur dioxide or other substances that are capable of oxidizing lead sulphide (Sanderson et al 1966). Therefore, the results had to be recorded shortly after opening the plates.…”

Ambient Air Monitoring for Sulfur Compounds

“…Serious limitations in this technique were observed by Sanderson et al 67 Although the chemical reaction is extremely sensitive, the stains are unstable and can be bleached in relatively short times by oxidation by air or ozone, or by the action of SO2 or light. A marked increase in sensitivity was produced by prehumidifying the sample, accomplished by passing the sample over a water surface.…”