determination of plants and foods using the picrate and acid hydrolysis methods.
15; water activity (aw): direct reading via a Decagon Aqualab 3TE digital thermo hygrometer at 25[degrees]C; free and total cyanide
(HCN): enzymatic/spectrophotometric method based on ESSERS (1993); and color: tristimulus colorimetry using a model CR 400 MINOLTA colorimeter, with L*, a* and b* values based on the parameters D65 (day light) and 10[degrees](observer angle) according to CIE Lab standards (CHROMA METER, 1989).
OI Analytical's CNSolution 3100 Cyanide Analyzer performs ASTM D 7511-09e2, automating total cyanide
analysis and providing throughput of 30 samples/hr.
The total cyanide
content in mg kg-1 were calculated by the formula described by Bradbury et al.
For unpeeled cassava fermentation, endogenous linamarase and microbial linamarase might have contributed to a faster reduction of the total cyanide
content of the fermenting cassava tubers (Figure 4).
EPA has prescribed standards for total cyanide
in drinking and aquatic-biota waters as 200 and 50 ppb; respectively [10, 11].
OI Analytical, College Station, Texas, has a compact modular system, the CNSolution Cyanide Analyzer, for flow injection analysis of available or total cyanide
2), and finding the difference between the total cyanide
measured before and after the chlorination.
Tests conducted during and since the 1995 incident, as part of an ongoing water quality monitoring program, show that total cyanide
levels in the Essequibo River have always been well within the US and Canadian drinking water standards.
Six ASTM methods covering sampling, preservation and analysis of free, available, and total cyanide
were included in the MUR.
Gourde affirmed that the total cyanide
contamination in the Omai River has already been substantially reduced and the river waters are beginning to visibly clear.
Ultraviolet irradiation of the sample can be added to measure total cyanide
every 2 minutes.