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Reduction of blank values in the determination of particulate cyanides.

Authors
Perkins-JB; Tharr-DG; Palassis-J; Fannin-DB; Eller-PM
Source
Appl Occup Environ Hyg 1990 Dec; 5(12):836-837
NIOSHTIC No.
00197812
Abstract
A method for reducing blank values when determining particulate cyanide (57125) concentrations was developed. When analyzing several sets of field samples for particulate cyanide content by NIOSH method 7904 the filter blanks were observed to contain 0.1 to blank readings was interfering material leached out of the mixed cellulose ester (MCE) membrane filters by 0.1 normal potassium- hydroxide. The potassium-hydroxide was used to trap hydrogen- cyanide (74908) that passed through the prefilter. An analysis of several lots of MCE filters showed blank cyanide concentrations of increased when the filters were stored for several days in filter cassettes before treatment with potassium-hydroxide. Polyvinyl- chloride (PVC) and polyvinyl/acrylic copolymer filters were investigated as alternatives. No background cyanide was detected even when the filters had been stored for several days before potassium-hydroxide treatment. The authors conclude that for minimizing blank cyanide values, the MCE filters should be replaced by PVC or polyvinyl/acrylic copolymer membrane filters.
Keywords
NIOSH-Author; Cyanides; Particulates; Filter-materials; Air-sampling; Air-filters; Membrane-filters; Particulate-sampling-methods
CODEN
AOEHE9
CAS No.
57-12-5; 74-90-8
Publication Date
19901201
Document Type
Journal Article
Fiscal Year
1991
NTIS Accession No.
NTIS Price
Issue of Publication
12
ISSN
1047-322X
Source Name
Applied Occupational and Environmental Hygiene
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