Apparatus and methods for monitoring the concentrations of hazardous airborne substances, especially lead
Air is sampled at a rate in excess of 100 L/min, preferably at 200-300 L/min, so as to collect therefrom a substantial fraction, i.e., at least 20%, preferably 60-100%, of airborne particulates. A substance of interest (analyte), such as lead, is rapidly solubilized from the the collected particulates into a sample of liquid extractant, and the concentration of the analyte in the extractant sample is determined. The high-rate air sampling and particulate collection may be effected with a high-throughput filter cartridge or with a recently developed portable high-throughput liquid-absorption air sampler. Rapid solubilization of lead is achieved by a liquid extractant comprising 0.1-1 M of acetic acid or acetate, preferably at a pH of 5 or less and preferably with inclusion of 1-10% of hydrogen peroxide. Rapid determination of the lead content in the liquid extractant may be effected with a colorimetric or an electroanalytical analyzer.
- Research Organization:
- ~Individually Owned Patent
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-31-109-ENG-38
- Assignee:
- Zaromb, Solomon
- Patent Number(s):
- 6,762,060
- Application Number:
- 08/377,966
- OSTI ID:
- 1174943
- Country of Publication:
- United States
- Language:
- English
Differential pulse anodic stripping voltammetry in a thin-layer electrochemical cell
|
journal | December 1976 |
Computer automation of anodic stripping voltammetry with a mercury film wall-jet electrode
|
journal | May 1985 |
The formation and properties of mixed lead sulfide—silver sulfide membranes for lead(II)-selective electrodes
|
journal | September 1978 |
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