Fast COD K-7320

NegotiableUpdate on 02/02

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Nature of the Manufacturer: Producers

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Overview

Imported COD reagent, Fast COD K-7320, is widely used in municipal and industrial laboratories to measure the concentration of all organic pollutants in wastewater. The concentration of pollutants is determined by measuring the amount of oxygen required to oxidize organic substances in the sample.

Product Details

Imported COD reagent test kit

scope	method	Catalog Number	Number of sample bottles
0-150 ppm（LR）	Dichromate reactor digestion	K-7350S *	25
0-150 ppm（LR）	Dichromate reactor digestion	K-7355 *	150
0-150 ppm（LR）	Dichromate reactor digestion	K-7351S	25
0-150 ppm（LR）	Dichromate reactor digestion	K-7356	150
0-1500 ppm（HR）	Dichromate reactor digestion	K-7360S *	25
0-1500 ppm（HR）	Dichromate reactor digestion	K-7365 *	150
0-1500 ppm（HR）	Dichromate reactor digestion	K-7361S	25
0-1500 ppm（HR）	Dichromate reactor digestion	K-7366	150
0-15,000 ppm（HR +）	Dichromate reactor digestion	K-7370S *	25
0-15,000 ppm（HR +）	Dichromate reactor digestion	K-7375 *	98
0-15,000 ppm（HR +）	Dichromate reactor digestion	K-7371S	25
0-15,000 ppm（HR +）	Dichromate reactor digestion	K-7376	98

Imported COD reagentsanalysis standard

product	Catalog Number
Calibration standard, 1000 ppm (200mL)	A-7301
Calibration standard, 10000 ppm (200mL)	A-7310

快速 COD K-7320method

COD measurement is widely used in municipal and industrial laboratories to measure the concentration of all organic pollutants in wastewater. The concentration of pollutants is determined by measuring the amount of oxygen required to oxidize organic substances in the sample.
Reference: USEPA, Analysis Methods for Water and Wastewater, Method 410.4 (1983); APHA Standard Method, 22nd edition, Method 5220 D-1997; A.M.Jirka，M.J.Carter， Micro semi-automatic analysis of chemical oxygen demand for surface water and wastewater, Analytical Chemistry, Volume 47, Page 1397 (1975); J. A. Winter "Method Study 3, Demand Analysis, Evaluation of Analysis Methods for Water and Wastewater", USEPA，1971； ASTM D 1252-00， The chemical oxygen demand of water (dichromate oxygen demand).

Dichromate reactor digestion method
CHEMetrics provides two dichromate reactor digestion methods (USEPA approved method and free mercury method) for rapid, simple, and safe determination of low, medium, and high concentrations of COD. The reagents used in the analysis methods recognized by USEPA contain mercuric sulfate, which is used to remove the interference of chloride. When there is no need to report to USEPA and the interference of chlorides can be ignored, free mercury products that are easier to post-treatment are very suitable.
CHEMetrics' leak proof reagent tubes contain pre measured solutions of sulfuric acid and potassium dichromate. When conducting COD measurement, the operator only needs to unscrew the spiral bottle cap lined with Teflon on the reagent bottle, add the sample into the reagent tube, and cover the cap. Then place the reagent tube into a standard digestion apparatus and heat it at 150 ℃ for 2 hours. After digestion is complete, any photometer that can accommodate a sample cell with a diameter of 16mm can read the measurement results.

快速COD K-7320

快速 COD K-7320Preparation before use

Check the test package: Ensure that the purchased COD rapid detection test package is within its validity period, the packaging is intact, and the contents are complete. Carefully read the instruction manual to understand the usage steps, precautions, and scope of application of the test package.

Prepare samples: Prepare an appropriate amount of water sample to be tested according to the requirements of the testing package. The collection of water samples should follow relevant standards to avoid contamination and deterioration. If dilution is required, it should be accurately diluted according to the ratio in the instructions.

Safety protection: Harmful chemicals may be involved in the COD detection process, so appropriate personal protective equipment such as gloves, goggles, etc. should be worn. At the same time, ensure that the operating environment is well ventilated and away from sources of fire and flammable materials.

Operation steps

Sample pretreatment: Some testing packages require pre-treatment of water samples, such as adjusting pH value, removing suspended solids, etc. Pre treat according to the instructions to ensure that the water sample meets the testing conditions.

Reagent addition: Open the test kit and remove the required reagents. According to the instructions in the manual, accurately add the corresponding amount of reagent to the water sample. Pay attention to the order and amount of addition to avoid confusion or excess.

Reaction and color development: After adding reagents, the water sample will begin to undergo chemical reactions and color development. The reaction time and color change may vary depending on the test package. Please wait patiently until the specified reaction time and observe whether the color change meets expectations.

Colorimetric reading: After the reaction is complete, use the colorimetric card or spectrophotometer provided in the test kit to perform colorimetric reading. Compare the color of the water sample with the standard color scale on the color chart, or directly input it into a spectrophotometer to read the data. Pay attention to avoiding light interference and parallax effects when reading.

Result calculation: Convert the reading to COD value according to the calculation formula or conversion table in the manual. Pay attention to the influence of dilution factors and other factors on the results.

Precautions

Avoid contamination: Throughout the entire testing process, strict measures should be taken to prevent cross contamination and external interference. Use clean containers and tools to avoid direct contact with water samples and reagents.

Accurate operation: Strictly follow the instructions to ensure the accuracy and repeatability of each step. Especially the control of the amount of reagents added and reaction time should be precise.

Storage conditions: Unused test kits should be stored in a dry, cool, and dark place, avoiding high temperatures, humidity, and direct sunlight. Opened reagents should be sealed and stored in a timely manner to prevent volatilization and deterioration.

Waste disposal: The waste generated during the testing process should be properly disposed of in accordance with relevant regulations to avoid causing secondary pollution to the environment.