Arsenic flour

Heavy Metals. The levels of lead, arsenic and heavy metals for cottonseed flour, flakes and cot-n-nuts are in Table IX. Under the category of heavy metals, lead, arsenic and mercury are included. Generally, adults consume about 0.2 to 0.3 mg of lead per day however, consumption of 2 to 3 mg per day (1 mg in children) for an... 

For the Mexican boll weevil a specially prepared calcium arsenate containing up to 20 per cent, of arsenic pentoxide is effective. This is prepared by heating together white arsenic and precipitated chalk in the presence of excess air at 650° C. The cotton plant is not injured by this preparation.10 In Peru about 30,000 acres of cotton fields are dusted annually from aeroplanes with calcium arsenate. Acid arsenates of calcium appear to be more toxic to boll weevils and to locusts than the basic arsenates. This is probably because the latter must be partially hydrolysed to compounds giving more soluble arsenic before toxic results are produced.11 The extensive application of such sprays to cotton plants is frequently followed by heavy infestations of the cotton aphis. This appears to be due in the first place to the positive photo-tropism of the winged females to white substances such as the arsenate, chalk or flour. Increase of the aphis population is then aided by the destruction by the spray of the hymenopterous parasites of the aphis.12... 

Detection limits range from 0.02ng/ml for arsenic to 0.80ng/ml for selenium, and precision values at lOng/ml are less than 6% relative standard deviation. Results of analyses of NBS standard reference materials (wheat flour, rice flour, spinach and orchard leaves) demonstrate the application of the method to the matrices. The layout of the apparatus is illustrated in Fig. 7.6. 

The Pure Food Law of 1906 was amended in 1938 to include pesticides on foods, primarily the arsenicals, such as lead arsenate and Paris green. It also required the adding of color to white insecticides, including sodium fluoride and lead arsenate, to prevent their accidental use as flour or other look-alike cooking materials. This was the first federal effort toward protecting the consumer from pesticide-contaminated food by providing tolerances for pesticide residues, namely arsenic and lead, in foods where these materials were necessary for the production of a food supply. 

AP = ammonium phosphate APAS = AP + ammonium sulfate FCAP = flour chrome arsenate phenol FRT = unidentified fire retardant ZAB = zinc ammonium borate. 

Wang and Fang [3] successfully determined arsenic in rice flour (NBS SRM 1568) and wine by FI-HGAAS, and obtained a better detection limit of 0.1 /xgl and sampling frequency of 220 h , but a prereduction, involving boiling of the sample with 10% KI reductani, was necessary. 

Precaution Violent reaction with organic matter explosive reactions possible Hazardous Decomp. Prods. Heated to decomp., emits very toxic fumes of l and K2O HMIS Health 1, Flammability 0, Reactivity 3 Uses Analysis (testing for zinc and arsenic) iodometry reagent food additive (dough conditioner, flour treatment agent) feed additive (trace mineral) medicine (topical antiseptic) oxidation of sulfur dyes Regulatory FDA 21 CFR 136.110, 184.1635, 582.80, GRAS... 

The most popular chronic poisons or rodenticides are coumarin (warfarin, fumarin, and racumin), fluoroacetamide, and strychnine or arsenic trioxide usually placed as an adequate amount of bait. The selection of the proper bait is key to mask off-odors and off-flavors associated with most poisons. The most popular baits are maize flour mixed with rolled oats, and oil and sugar or syrup. The food attractant can be offered as a solid pellet, or even in a liquid base. The last option is effective... 

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