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Use of a malathion wettable powder for surface application to bagged rice bran
Author(s) -
McFarlane J. A.
Publication year - 1961
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740121005
Subject(s) - bran , contamination , wettable powder , malathion , chemistry , residue (chemistry) , food science , zoology , pesticide , agronomy , biology , raw material , ecology , biochemistry , organic chemistry
Twenty‐seven 100‐lb. bags of rice bran were sprayed on their upper sides with approximately 160 mg. of malathion per sq. ft. as each layer of a 3 × 3 × 3 stack was completed. Finally the sides of the stack were similarly sprayed. Samples (1000 g.) were taken from single bags, or from grouped bags, 1 and 3 weeks after spraying in order to assess the degree of contamination of the bran. A single sample of the bran obtained by brushing out a number of the sampled bags was also taken on each occasion. Contamination (estimated by a standard analytical procedure) was not more than 0.5 p.p.m. in samples drawn after 1 week from the bulk of the contents of tested bags, and 1.6 p.p.m. in the residue (approximately 1000 g.) obtained by brushing out six bags. Overall contamination was estimated at not more than 0.51 p.p.m., allowing for contamination in both the main bulk and the residual bran. Contamination in samples taken 3 weeks after treatment was found to be nil in all of three samples taken from the mixed contents of nine bags. Contamination in the residual bran (approximately 1400 g.) obtained by brushing out the same nine bags was found to be 0.8 p.p.m. Maximum overall contamination at 3 weeks was estimated at not more than 0.11 p.p.m. In a subsequent test a single lightweight (16‐oz.) jute bag containing 100 lb. of bran was heavily oversprayed, set aside for 1 week, and the contents subsequently stored for 4 more weeks in a clean bag. Samples taken after 1,2 and 5 weeks showed only low levels of malathion contamination.