Determination of total biogenic sulfur gases by filter/flash vaporization/flame photometry

Development of a method for the sampling and analysis of sulfur dioxide and nitrogen dioxide from ambient air

“…These considerations narrowed the focus of our development efforts to sorbents and filters. Sulfur dioxide is relatively easy to collect and has been sampled successfully at stack concentrations using uncoated molecular sieves (MS) (3) and at ambient concentrations using various impregnated filters (4)(5)(6)(7)(8)(9)(10). The reported aqueous impregnating solutions usually contained the hydroxide, bicarbonate, or carbonate salts of sodium or potassium, along with glycerin or triethanolamine (TEA) as an humectant.…”

Evaluation of metallic foils for preconcentration of sulfur-containing gases with subsequent flash desorption/flame photometric detection

“…In addition to these preceding techniques, other systems have been devised for the collection and subsequent quantitative determination of total gaseous sulfur at low-and sub-part-per-billion (v/v) concentrations (15,16). One such approach developed in our laboratory involved the oxidative conversion of reduced sulfur gases to sulfur dioxide, which was subsequently collected on glass fiber filters (16). The extracts from these filters were then analyzed for sulfur via flash vaporization/flame photometry (FV/FPD) using small platinum boats.…”

“…Purified sulfur-free air was prepared by passing compressed laboratory air through a multibed solid adsorbent filter cartridge (13). The standard sulfur gas concentrations were prepared by use of the dilution procedures previously described (13,16,25). Standard gas concentrations in the 1 to 20 ppb (v/v) range could be prepared with a precision of approximately ±10% from the gravimetrically calibrated permeation devices whose loss rates ranged from 20 ng of S/min to 200 ng of S/min.…”

Validation of ppb/ppt Sulfur Gas Standards by Independent Analytical Methods

“…quartz tube housed inside a Thermolyne tube furnace held at an optimum temperature for the conversion of that particular sulfur compound to SO2. 15 The resultant SO 2 stream was then passed into a Monitor Labs Model 8850 Fluorescent SO2 Analyzer. Data were recorded on a strip chart recorder in a continuous mode since this SO 2 analyzer, when operated at its low range, typically took at least 15 minutes from the introduction of a new concentration to achieve a steady-state response level.…”