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In the present investigation we purpose a simple, rapid and accurate method for the evaluation of sodium nitroprusside. In alkaline medium and on the presence of thiourea, a new complex is formed. The acidification of medium induced a blue solution (lambda m = 600 nm) that could be determined by spectrophotometry.

A study is performed on polychlorinated biphenyl (PCB) congener residues in samples of human blood and milk as well as in falcon and pigeon eggs. Most of the PCB congeners found in these biological samples were quantified by high-resolution gas chromatography (HRGC). A PCB technical mixture--namely, DP6 (Phenochlor)--was used for the calibration as its composition was previously determined by HRGC-mass spectrometry. The usefulness of such a congener analysis is outlined. It is the first time to the best of our knowledge that a Phenochlor mixture is used for standardization.

This paper provides preliminary findings on organochlorine residues in Tunisian foodstuffs, i.e.: butter, milk, cheese, fish, canned tuna and sardines, beef, egg yolk, chicken and beef liver. The techniques used are HPLC, MS-GC, ECD-GC.

This paper reports some preliminary results concerning hexachlorobenzene (HCB) contamination of Tunisian human milk, human cord and adult blood and foodstuffs (cows' milk, meat, eggs). The analyses were performed by gas chromatography with electron-capture detection.

A large collection of human milk samples and cord blood from various hospitals of Tunis is studied for organochlorine residues. Some results obtained by ECD-GC are given.