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Investigation on the origin of the Chinese Trichloroisocyanuric Acid (TCCA)

The new network News February 12, the US Department of Commerce announced the preliminary results of countervailing duty investigation on the origin of the Chinese Trichloroisocyanuric Acid (TCCA). Subsidy rate two mandatory respondent companies was 18.57% and 1.55%, respectively, across the country subsidize other enterprises involved in the rate of 10.06%. US Department of Commerce will be expected to make the case this year, June 30 final countervailing duty investigations, the US International Trade Commission will be held August 12 to make final damage. If the damage is affirmative final determination, the US Department of Commerce countervailing duty order will be released on August 19.
A convenient synthesis of sulfonamides from thiols is described. In situ preparation of sulfonyl chlorides from thiols is accomplished by oxidation with trichloroisocyanuric acid (TCCA), benzyltrimethylammonium chloride and water (2.5 equiv). The sulfonyl chlorides are then further allowed to react with excess amine in the same reaction vessel. Triethylamine can be optionally added as acid scavenger.
A chemiluminescent (CL) method for the determination of isoniazid is described. The method is based on the CL generated during the oxidation of luminol by sodium dichloroisocyanurate (SDCC) and trichloroisocyanuric acid (TCCA) in alkaline medium. It was found that isoniazid greatly enhances this CL intensity when present in the luminol solution. Based on this observation, a new flow-injection CL method for the determination of isoniazid has been proposed in this paper. The detection limits were 2 and 3 ng ml–1 isoniazid for the SDCC-luminol and TCCA-luminol CL systems, respectively. The relative CL intensity was linear with the isoniazid concentration in the range of 4–100 and 100–200 ng ml–1 for the SDCC-luminol CL system, and 6–200 and 200–1000 ng ml–1 for the TCCA-luminol CL system. The results obtained for the assay of pharmaceutical preparations compared well with those obtained by the official methods and demonstrated good accuracy and precision.