Chemistry: analytical and immunological testing – Sulfur containing – Total or elemental sulfur
Patent
1997-06-09
2000-01-11
Warden, Jill
Chemistry: analytical and immunological testing
Sulfur containing
Total or elemental sulfur
422 83, 436119, G01N 3112
Patent
active
060135301
ABSTRACT:
In a sulfur determining process, comprising a hydrocracking step of a sample in a ceramic reactor and darkness measuring step of lead acetate soaked tape by reaction of produced H.sub.2 S, an improvement is made. The improvement comprises at least one of procedure selected from the group consisting of introduction of CO.sub.2 in the ceramic reactor, using an inverted AC current from stabilized DC current as an electric supply for the darkness measuring step, covering a box containing the darkness measuring sensor and a sensor circuit with a heat insulating material, A/D converting a differential output and making moving averages for making a noiseless record, and charging the differential output to a condenser through an electric resistance for making a noiseless record. Sulfur content is measured from a record of improved output. According to the improvements, an economic conventional ceramic reactor becomes available, and limit of sulfur determination of 25 ppb is improved to 2 ppb in the best case.
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