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In the literature for odor threshold, values of phosphine are given which vary between 3 ppm1,2 and 0.02 ppm.3 According to another paper phosphine is odorless even in concentrations up to 200 ppm.4 Since phosphine prepared from metal phosphides is used as a fumigant for foods, feeds, and processed food products, we carried out new investigations to clarify the discrepancy.
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Ekkehard Fluck (1976) studied this question.
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