Abstract
AbstractA rapid, sensitive and reliable mixed indicator paper strip impregnated with dimethyl yellow (0.05%), cresol red (0.1%) and mercuric chloride (1.0%) in methanol has been developed for the detection of phosphine (PH3) in air at the permissible level (TLV). The paper strip turns red in the presence of phosphine. It is highly sensitive and has better shelf‐life than indicator strips impregnated with dimethyl yellow plus mercuric chloride or cresol red plus mercuric chloride.
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