Development of Low Concentration Phosphine Gas Detection Tube
Through experiments,the indicator formula was optimized and a phosphine detection tube was prepared.The results showed that when using a mercury chloride and sodium chloride system,controlling water content at 20%and ventilation at 100 mL,the prepared detection tube had a clear color changing interface,good repeatability,and a phosphine concentration range of 20 mg/L to 200 mg/L.The color changing length of the detection tube was well fitted with gas concentration,with a linear correlation coefficient above 0.999.
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