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en-iso-7393-2-free-and-total-chlorine-analysis-in-drinking-water
Potable Water Microbiological & Chemical Analysis APHA 2540 Total Dissolved Solids (TDS) Testing in WaterAPHA 4500-H+ pH Measurement of Drinking WaterAPHA 9221 Multiple-Tube Fermentation Technique for ColiformsASTM D1067 Acidity and Alkalinity Testing in Water SamplesASTM D1125 Electrical Conductivity Measurement of WaterASTM D1126 Standard Test Method for Turbidity of WaterASTM D1253 Residual Chlorine Testing in Water SamplesASTM D1783 Determination of Nitrate in WaterASTM D1946 Gas Chromatography of Volatile Organic Compounds in WaterASTM D2216 Moisture Content of Soil and RockASTM D2974 Moisture, Ash, and Organic Matter of Sludge by Loss on IgnitionASTM D3370 Determination of Total Organic Halogens in WaterASTM D3559 Determination of Total Phosphorus in WaterASTM D3867 Nitrite and Nitrate Analysis in Potable WaterASTM D512 Chloride Concentration Testing in Water SamplesASTM D512 Total Chloride Ion Determination by TitrationASTM D516-89 Determination of Cyanide in WaterASTM D5176 Measurement of Alkalinity in WaterEN 1622 Chlorine Odor and Taste Testing in Drinking WaterEN 26777 Nitrite Content Analysis in Potable WaterEN ISO 10304-1 Ion Chromatography for Anions in Potable WaterEN ISO 10304-3 Determination of Dissolved Anions by Ion ChromatographyEN ISO 10523 pH Measurement of Water QualityEN ISO 11256 Determination of Total Chromium in WaterEN ISO 11369 Cyanide Content Analysis in Water SamplesEN ISO 11732 Ammonium Testing in Drinking Water via FIAEN ISO 11732 Determination of Ammonium in Water by Flow AnalysisEN ISO 11885 Inductively Coupled Plasma for Metal Analysis in WaterEN ISO 11901 Determination of Bromide in Water SamplesEN ISO 11905-1 Nitrogen Analysis via Devarda’s Method in WaterEN ISO 11905-2 Determination of Nitrogen in Water SamplesEN ISO 14403 Determination of Pesticides in Water by GC-MSEN ISO 5663 Guidelines for Sample Preparation of Water TestingEN ISO 5667-1 Guidance on Sampling Water QualityEN ISO 5667-17 Guidance on Sampling for Particles in WaterEN ISO 5667-21 Sampling of Sediments for Chemical AnalysisEN ISO 7027 Turbidity Testing of Drinking Water SamplesEN ISO 7393-1 Chlorine Quantification Using Titrimetry in WaterEN ISO 7887 Color Determination in Potable Water SamplesEN ISO 8466-1 Water Quality – Determination of pHEN ISO 8467 Permanganate Index Testing in Drinking WaterEPA 110.3 Determination of Phenols in WaterEPA 1604 Enterococci Bacteria Detection in Drinking WaterEPA 1664 Measurement of Oil and Grease in WaterEPA 200.1 Inductively Coupled Plasma-Atomic Emission SpectrometryEPA 200.7 Trace Metal Determination in Drinking Water by ICP-AESEPA 200.8 Trace Elements in Drinking Water Using ICP-MSEPA 200.9 Trace Elements Determination by GFAAS in Drinking WaterEPA 300.0 Inorganic Anions Determination by Ion ChromatographyEPA 300.1 Anions Analysis Including Fluoride and Nitrate in WaterEPA 300.1 Determination of Chloride in Drinking WaterEPA 300.2 Determination of Sulfate in WaterEPA 335.4 Cyanide Measurement in Drinking Water SamplesEPA 350.1 Determination of Chemical Oxygen Demand (COD)EPA 350.2 Measurement of Total Organic Carbon in WaterEPA 353.2 Nitrate-Nitrite Testing in Potable Water SamplesEPA 365.2 Determination of Phenolic Compounds in WaterEPA 410.4 Analysis of Cyanide in Water SamplesEPA 505 Organochlorine Pesticides Analysis in Potable WaterEPA 524.2 Purgeable Organic Compounds Testing in Water SamplesEPA 524.3 VOC Analysis in Potable Water Using GC/MSEPA 524.4 Measurement of Disinfection Byproducts in WaterEPA 531.2 Carbamate Pesticides Detection in Drinking WaterEPA 551.1 Determination of Carbon Tetrachloride in Drinking WaterEPA 552.3 Haloacetic Acids Testing in Potable WaterEPA 600/4-79-020 Colorimetric Analysis of OrthophosphateEPA 600/4-80/014 Chlorophyll-a Determination in WaterEPA 601 Method for Determination of Polychlorinated Biphenyls (PCBs)EPA 608 Pesticides and PCBs Testing in Drinking Water SamplesEPA 608 Pesticides and PCBs Testing in Drinking Water SamplesEPA 625 Methods for Volatile Organic Compounds Analysis in WaterEPA 815-B-17-015 Cryptosporidium and Giardia Detection in WaterEPA 8270 Semi-Volatile Organic Compounds Analysis in WaterEPA 906.0 Determination of Mercury in Water by Cold Vapor Atomic AbsorptionEPA 906.0 Mercury Analysis by Cold Vapor Atomic AbsorptionEPA 906.0 Mercury Determination by CVAASIS 10500 Fluoride Level Compliance Testing in Potable WaterIS 10500 Nitrate Level Analysis in Drinking WaterIS 3025 Part 34 Phenolic Compounds Testing in Potable WaterISO 10530 Measurement of Turbidity in Water SamplesISO 11369 Cyanide Determination in WaterISO 15586 Atomic Absorption for Mercury Detection in WaterISO 15680 VOC Detection by Purge and Trap GC/MS in WaterISO 15681 Determination of Polychlorinated Biphenyls (PCBs) in WaterISO 15705 Determination of Total Organic Carbon in WaterISO 15705 Measurement of Total Organic Carbon (TOC) in WaterISO 16265 Trihalomethane Concentration Testing in Drinking WaterISO 17993 Determination of Mercury in Water by CVAASISO 5667-10 Sampling of WastewatersISO 5667-13 Guidance on Sampling for Cyanobacteria and AlgaeISO 5667-14 Guidance on Sampling for Microorganisms in WaterISO 5667-15 Guidance on Sampling for Metals in WaterISO 5667-18 Guidance on Sampling for Volatile Organic CompoundsISO 5667-19 Guidance on Sampling for Trace ElementsISO 5667-2 Guidance on Sampling StrategiesISO 5667-20 Guidance on Sampling for Microcystins and Other CyanotoxinsISO 5667-3 Sampling Protocols for Microbiological Water TestingISO 5667-4 Guidance on Sampling Preservation and HandlingISO 5667-5 Sampling Strategy for Drinking Water AnalysisISO 5667-6 Water Sampling – Guidance on Sampling TechniquesISO 7028 Sampling of Water for Chemical and Microbiological TestingISO 7887 Water Sample Color Measurement for Quality ControlISO 7888 Electrical Conductivity Testing of Drinking WaterISO 9308-1 E. coli and Coliform Bacteria Testing in Drinking WaterISO 9963-1 Determination of Carbon Dioxide in WaterWHO Guidelines-Based Lead Content Testing in Potable Water

Complete Guide to EN ISO 7393-2 Free and Total Chlorine Analysis in Drinking Water Testing Service by Eurolab

EN ISO 7393-2 is an international standard for the analysis of free and total chlorine in drinking water. The standard was developed by the International Organization for Standardization (ISO) and published in 2007. The standard has undergone several revisions, with the latest version being EN ISO 7393-2:2020.

Legal and Regulatory Framework

The analysis of free and total chlorine in drinking water is governed by various national and international regulations. In the European Union, for example, the Drinking Water Directive (98/83/EC) sets out the requirements for the quality of drinking water, including the maximum allowable concentrations of free and total chlorine.

In the United States, the Environmental Protection Agency (EPA) regulates the analysis of free and total chlorine in drinking water under the Safe Drinking Water Act (SDWA). The EPA has established a maximum contaminant level (MCL) for total chlorine of 4.0 mg/L.

International and National Standards

The following standards are relevant to EN ISO 7393-2:

  • ISO 7393-2:2007

  • EN ISO 7393-2:2008

  • ASTM D4851-08 (2008)

  • TSE 645:2010 (Turkey)

  • ANSI/AWWA B101-09 (USA)

    • Standard Development Organizations

    The standard development organizations involved in the development of EN ISO 7393-2 include:

  • International Organization for Standardization (ISO)

  • European Committee for Standardization (CEN)

  • American Society for Testing and Materials (ASTM)

  • Turkish Standards Institution (TSE)

  • American Water Works Association (AWWA)

    • Evolution of Standards

    Standards evolve over time to reflect changes in technology, science, and regulatory requirements. EN ISO 7393-2 has undergone several revisions since its initial publication in 2007.

    Standard Numbers and Scope

    The standard numbers and scope for EN ISO 7393-2 are as follows:

  • Standard Number: EN ISO 7393-2

  • Title: Water quality Determination of free and total chlorine Part 2: Potassium iodide method

  • Scope: This part of ISO 7393 specifies a method for the determination of free and total chlorine in drinking water using the potassium iodide method.

    • Standard Compliance Requirements

    Compliance with EN ISO 7393-2 is required by various industries, including:

  • Drinking water treatment plants

  • Water utilities

  • Laboratories

  • Regulatory agencies

    • Why this specific test is needed and required

    The analysis of free and total chlorine in drinking water is essential to ensure the safety and quality of drinking water. Chlorine is commonly used as a disinfectant in drinking water treatment plants, but excessive concentrations can cause unpleasant taste and odor problems.

    Business and Technical Reasons for Conducting EN ISO 7393-2

    The analysis of free and total chlorine in drinking water is required by regulatory agencies to ensure compliance with drinking water standards. Laboratories and water utilities also conduct this test as part of their quality control procedures.

    Consequences of Not Performing this Test

    Failure to analyze free and total chlorine in drinking water can lead to:

  • Unpleasant taste and odor problems

  • Health risks associated with excessive chlorine concentrations

  • Non-compliance with regulatory requirements

    • Industries and Sectors that Require this Testing

    The following industries and sectors require EN ISO 7393-2 testing:

  • Drinking water treatment plants

  • Water utilities

  • Laboratories

  • Regulatory agencies

    • Risk Factors and Safety Implications

    Excessive concentrations of free and total chlorine in drinking water can pose health risks to consumers.

    Quality Assurance and Quality Control Aspects

    EN ISO 7393-2 requires laboratories to follow strict quality assurance and quality control procedures, including calibration and validation of equipment.

    How this Test Contributes to Product Safety and Reliability

    The analysis of free and total chlorine in drinking water ensures that the product meets regulatory requirements and is safe for human consumption.

    Competitive Advantages of Having this Testing Performed

    Companies that conduct EN ISO 7393-2 testing can demonstrate their commitment to quality and safety, which can be a competitive advantage in the market.

    Cost-Benefit Analysis of Performing this Test

    The cost-benefit analysis of performing EN ISO 7393-2 testing includes:

  • Cost savings associated with preventing unpleasant taste and odor problems

  • Reduced risk of health problems associated with excessive chlorine concentrations

  • Compliance with regulatory requirements

    • Step-by-Step Explanation of How the Test is Conducted

    The test is conducted as follows:

    1. Sampling: A sample of drinking water is collected from a treatment plant or distribution system.

    2. Preparation: The sample is prepared for analysis by adding potassium iodide reagent.

    3. Analysis: The free and total chlorine concentrations are measured using a spectrophotometer.

    Equipment Calibration and Validation

    The equipment used in the analysis must be calibrated and validated according to EN ISO 7393-2 requirements.

    Measurement Techniques

    EN ISO 7393-2 specifies two measurement techniques:

  • Potassium iodide method

  • DPD method

    • Sample Preparation

    The sample preparation involves adding potassium iodide reagent to the sample to release free chlorine.

    Analysis

    The free and total chlorine concentrations are measured using a spectrophotometer.

    Results Calculation

    The results of the analysis are calculated as follows:

    Free Chlorine (mg/L) A x B

    Total Chlorine (mg/L) C x D

    where A, B, C, and D are constants specified in EN ISO 7393-2.

    Quality Control Procedures

    EN ISO 7393-2 requires laboratories to follow strict quality control procedures, including calibration and validation of equipment.

    Interpretation of Results

    The results of the analysis must be interpreted according to EN ISO 7393-2 requirements.

    Test Report

    A test report must be prepared according to EN ISO 7393-2 requirements.

    Conclusion

    EN ISO 7393-2 is an essential standard for the analysis of free and total chlorine in drinking water. Laboratories, water utilities, and regulatory agencies must comply with this standard to ensure the safety and quality of drinking water.

    Please note that the above text is a sample and you should consult the actual standard for more information.

    ---

    Test Report

    The following test report template can be used for EN ISO 7393-2 testing:

    Test Report No.: _____________________________________________________

    Date: _______________________________________________________________

    Sample ID: ____________________________________________________________

    Client Name: _______________________________________________________

    Sample Description: __________________________________________________

    Results:

    Parameter Unit Result

    --- --- ---

    Free Chlorine mg/L _______

    Total Chlorine mg/L _______

    Conclusion:

    The sample meets the requirements of EN ISO 7393-2.

    ---

    I hope this helps! Let me know if you have any questions or need further assistance.

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