COD Vials w/ Mercury, EPA Approved
| Item No. | Description | Price |
|---|---|---|
| B1010 | COD Digestion Vials w/Hg, 0-150mg/L, 100pk | $109.00 |
| B1015 | COD Digestion Vials w/Hg, 0-1500mg/L, 100pk | $109.00 |
Question/Answer
Are the vials calibrated for accuracy
Each lot of vials is checked against a standard solution and against a competitor’s vials to ensure that they give the proper response after digestion.
to what level of chlorides is compensated before dilution is required
The vials contain enough mercuric sulfate to compensate for up to 2,000 mg/L chloride.
How much mercury is in the COD vials, 0-1500mg/L?
Each of these vials contain 0.07425 g Hg.
What hazardous chemicals are contained in COD vials
COD vials contain several hazardous reagents. Mercuric sulfate is required by regulating authorities to compensate for chloride interference. Potassium dichromate is the active color changing species in the reaction. Sulfuric acid gets the solution into an acceptable pH range for the reaction to occur. Silver sulfate serves as a catalyst for the oxidation of some of the more complex organic compounds. All four of these reagents qualify the mixture for the hazardous list. Please email me at davids@envexp.com if you would like a MSDS sheet for complete documentation.
How much mercury is in the COD vials, 0-150mg/L?
For the 0-150 mg/L COD vials that contain Hg there is 0.07425g of Hg / vial.
What is the shelf life of the COD vials?
5 years from the date of manufacture.
We are using a competitive brand of COD vials w/Hg and still having a positive Cl interference down to a 250 ug Cl level. Do you have experimental data to show your vials eliminate Cl interference?
Our COD vials contain 40mg of mercuric sulfate in each vial. Mercuric sulfate is most effective with the ratio of mercuric sulfate to chloride is 10:1. Our vials will effectively treat chloride interferences in a sample containing up to 2000 ppm of chloride (4 mg). For samples exceeding 2000ppm of chloride we recommend diluting the sample prior to digestion.