东西仪（北京）科技有限公司 Performance Measuring Range 0.002 to 0.02 mg Sampling Time 45 seconds per 1 pomp stroke Detecting Limit 0.0002 mg Colour Change White → Brown Reaction Principle Gus generation tube : Sulphides H2SO4 →H2SDetector tube : H2S Pb(CH3COO)2 → PbS Shelf Life 3 Years Corrections for temperature &humidity Unnecessary Coefficient ofVariation 5%(for 0.002 to 0.02 mg) Possible coexisting substances and theirinterferences (*TE) Substance Concentration Interference Change colour by itselfto Chlorideion No No Chromate ion No No
