Details

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🧪 Product Overview

• Model: HI93754A‑25

• Type: Low‑Range COD reagent kit using the EPA-approved dichromate method (with mercuric sulfate for chloride suppression) 

• Test count: 25 pre-dosed vials (approx. 3 mL each) 

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📋 Measurement Range & Performance

• Concentration Range: 0 – 150 mg/L O₂

• Resolution: 1 mg/L

• Accuracy: ±5 mg/L plus ±5% of reading 

• Designed for wastewater, environmental, and industrial samples that may contain chloride—thanks to mercuric sulfate inclusion 

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🔬 Test Procedure & Features

• Vials contain pre-measured reagents, cutting down time on prep and cleanup 

• Follow EPA Method 410.4: heat the sealed vial under acidic conditions → hexavalent chromium is reduced to trivalent → measure color intensity → photometer displays COD in mg/L O₂ 

• Many photometers support barcode detection for method and lot tracking—ideal for GLP compliance

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⚠️ Safety & Disposal

• Contains mercuric sulfate (HgSO₄):

  • Effective at reducing chloride interference

  • Means used vials are classified as hazardous mercury waste—must be disposed of accordingly