Determination of Halogens in Organic Compounds

Colorimetric Determination of DDT in Milk and Fatty Materials

“…Any attempt to detect 0.1 mg. of DDT in 100 grams of milk (equivalent to 1 p.p.m.) by any of the published methods of analysis (1,4,6,12, IS, 15, 19) is likely to encounter difficulty because of the large amount of interfering fatty matter.…”

Colorimetric Determination of DDT.Color Test For Related Compounds

“…Much of the analytical work on DDT has depended on chlorine determinations. Either the "labile" chlorine split out on dehydrochlorination by alcoholic alkali can be determined, as recommended by Neal et al (.21) and by Gunther (9), or else the total chlorine can be determined by some method such as the Parr bomb, Carius, or Umhoefer (26), or by a modification of the Winter method proposed by Hall ef al. (12).…”

Insecticide Residues, A Screening Method for the Determination of Organically Bound Chlorine from Certain Insecticides in Fat

“…The dispersed sodium procedure for the dehalogenation of the insecticide was adapted from the work of Menville and Parker (4). This method decomposes organic, halogen-containing compounds in minutes rather than hours, as in the usual sodium-isopropyl alcohol (8, 72) or sodium-jw-butyl alcohol (12) procedures. The dispersed sodium used was that recommended by Menville and Parker (4).…”

“…A series of 11 fat samples which showed negative results by paper chromatography gave an average of 4 p.p.m. of chloride (fat plus reagents), whereas a series of 12 samples which showed a trace (less than 1 p.p.m.) of chlorinated insecticides by paper chromatography gave an average of 5 p.p.m.…”