HJ 70-2025 Chlorine Calibration Method for High Chlorine COD Dissolver

NegotiableUpdate on 05/06

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Overview

Based on the guidance of HJ 70-2025 "Determination of Chemical Oxygen Demand in Water Quality - Chlorine Calibration Method" and the actual needs of users, the TC-100F high chloride COD digester has been designed. This instrument eliminates the interference of high chloride ion content on COD determination and can be used as a standard instrument for measuring chemical oxygen demand (COD) in high chloride wastewater with chloride ion content less than 20000mg/L. It is suitable for the determination of COD in wastewater from oil fields, coastal refineries, oil depots, chlor alkali plants, etc. HJ 70-2025 Chlorine Calibration Method for High Chlorine COD Dissolver

Product Details

1HJ 70-2025 Chlorine Calibration Method for High Chlorine COD DissolverProduct Introduction

Determination of Chemical Oxygen Demand in Water Quality Potassium dichromate method（HJ 828-2017）According to regulations, this standard does not apply to chloride ion concentrations greater than1000mg/LDiluted saltwater. When the chloride ion content exceeds1000mg/LWhen,CODThe low allowable limit is250mg/LAccuracy below this value is unreliable. Therefore,HJ 828-2017Not applicable to high chloride ion wastewater. Our company follows industry standards《HJ 70-2025water quality Determination of Chemical Oxygen Demand Chlorine gas calibration method》Designed with guidance based on the actual needs of usersTC-100FType high chlorineCODDissolver, this instrument eliminates the impact of high chloride ion content onCODThe interference measured can be considered as a chloride ion content less than20000mg/LChemical Oxygen Demand in High Chlorine Wastewater(COD)The measuring standard instrument is suitable for wastewater from oil fields, coastal refineries, oil depots, chlor alkali plants, and other industriesCODThe measurement.

IIHJ 70-2025 Chlorine Calibration Method for High Chlorine COD DissolverKey Features:

1. According to the industry standardAccording to the requirements of HJ 70-2025, nitrogen circulation throughout the digestion process meets the technical requirements

2. Equipped with 4/8/10A flow meter (high-end) that can individually control the nitrogen flow rate for each sample, saving nitrogen and improving experimental accuracy

3. Using (4 asbestos heating plates, 8/12Microcrystalline glass heating plate), can be used simultaneously4/8/10A sample and1/2A comparative sample（8-digit none digestion experiment

4. Built in high-power fan, using air cooling technology instead of water cooling, combined with glass burr condensation reflux pipe cooling, effectively saves water and energy

5. Using a specially designed triangular flask for digestion, it can be directly titrated after digestion, making it convenient for experimental personnel to operate

3、 Technical indicators:

1. Anti chlorine interference: 1000～20000mg/L（according toHJ 70-2025 Determination of Chemical Oxygen Demand in Water Quality - Chlorine Calibration Method,Above, please followHJ/T132-2003 experiment)

2. Detection limit: 30mg/L

3. Nitrogen flow rate: adjustable from 5 to 60mL/min

4. Measurement range: ≤ 1000mg/L (greater than dilution)

5. Dissolving time: 2 hours (with a time adjustment amplitude of 10 minutes)

6. Dissolving volume: 250mL

7. Dissolving digit: 4+1 (compared sample)、8 digits、10+2(Comparison sample)

8. Measurement error: ≤ 500mg/L, relative standard deviation not exceeding 5.0%; ≤1000mg/L， The relative standard deviation is not greater than 8.0%

9. Heating device: 5-position: asbestos heating plate; eight/12Position: Microcrystalline glass heating plate

10Work environment:（5～40）℃； Relative humidity<85% (no condensation);

11. Heating power: 5 digits: 1400W；8-bit: 2000W；12Position:2000W（220V，50HZ）

4、 Product configuration

1. Host (4/8)/10A flow meter)1 unit