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The current study was performed to determine the kinds of organophosphorus pesticides residue in milk sample in state of Khartoum-Sudan. 66 samples were collected from breeding farms widespread the state, regarding the areas of high farms concentration. Samples were collected in sterile vacutainers frigid, extracted and analyzed using gas chromatograph GC/FID. Two pesticides belong to organophosphorus group were detected (Dimethoate and Chloropyrifos). 4% of Khartoum bahri samples contained the two pesticides, while Khartoum and Omdurman recorded 21% and 5.26% respectively. 92% of dimethoate positive samples from Khartoum Bahri area exceeded the maximum residue limits, while Khartoum and Omdurman showed the same percentage 84.2%. All Choloropyrifos positive samples were below the maximum residue limits.

In presence of sodium hydrogen carbonate N-bromosuccinimide readily and quantitatively oxidises aqueous solutions of sodium arsenite to sodium arsenate. The reaction takes place at room temperature, and N-bromosuccinimide is irreversibly reduced to succinimide, with the formation of hydrogen bromide. The determination of sodium arsenite and arsenious oxide by titration with standard N-bromosuccinimide solution is described. The experimental error does not exceed f 2 per cent. Results are reported for comparative analyses of the same samples by the proposed method and by the generally accepted iodine method.SODIUM arsenite has been used in the treatment of sheep heIrninthiasis,lp2 and arsenites have proved to be effective insecticide^,^,^ e.g., sodium arsenitelime dust for Anabms simfiZex.6

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