Residue Analysis
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Nitrate and Nitrite Residue Analysis/
ISO 7887 Water Quality — Determination of Nitrate and Nitrite
ISO 7887 Water Quality Determination of Nitrate and Nitrite Laboratory Testing Service Provided by Eurolab
Standard-Related Information
ISO 7887 is an international standard that provides a method for the determination of nitrate and nitrite in water samples. The standard was first published in 1985 and has undergone several revisions since then. The latest version, ISO 7887:2016, was published in 2016.
The standard is applicable to all types of water, including drinking water, wastewater, and surface water. It provides a detailed procedure for the extraction and determination of nitrate and nitrite using ion chromatography or spectrophotometry.
Legal and Regulatory Framework
The legal and regulatory framework surrounding ISO 7887 testing is governed by various national and international standards. In the European Union, for example, the standard is referenced in the Drinking Water Directive (98/83/EC) and the Urban Wastewater Treatment Directive (91/271/EEC). Similarly, in the United States, the standard is referenced in the Safe Drinking Water Act (SDWA).
International and National Standards
The following international standards apply to ISO 7887 testing:
The following national standards also apply:
Standard Development Organizations
The International Organization for Standardization (ISO) is responsible for developing and maintaining the ISO 7887 standard. Other organizations, such as the American Society for Testing and Materials (ASTM) and the European Committee for Standardization (CEN), also contribute to the development of standards related to water quality testing.
Standard Evolution and Update
Standards evolve and get updated regularly to reflect changes in technology, scientific knowledge, and regulatory requirements. The ISO 7887 standard, for example, has undergone several revisions since its initial publication in 1985. The latest revision, ISO 7887:2016, incorporates new methods and techniques for the determination of nitrate and nitrite.
Standard Compliance Requirements
Compliance with standards is a critical aspect of laboratory testing services. Laboratories that provide ISO 7887 testing must demonstrate compliance with relevant national and international standards. This involves implementing quality management systems (QMS) and following established protocols for sample preparation, testing, and reporting.
Standards for Different Industries
Different industries have varying requirements for water quality testing. The following are some examples of industry-specific standards:
Consequences of Not Performing the Test
Not performing the ISO 7887 test can have serious consequences, including:
Industries and Sectors that Require this Testing
The following industries and sectors require ISO 7887 testing:
Risk Factors and Safety Implications
Performing the ISO 7887 test involves several risk factors and safety implications, including:
Quality Assurance and Quality Control
Quality assurance and quality control are critical aspects of laboratory testing services. Laboratories that provide ISO 7887 testing must implement a QMS that ensures the accuracy, reliability, and validity of test results.
Test Conditions and Methodology
The following is a step-by-step explanation of how the ISO 7887 test is conducted:
1. Sample Preparation: Water samples are collected and prepared for analysis.
2. Instrumentation: Ion chromatography or spectrophotometry instruments are used to determine nitrate and nitrite levels.
3. Calibration: Instruments are calibrated using certified standards.
4. Testing: Samples are tested according to established protocols.
5. Reporting: Results are reported in accordance with regulatory requirements.
Ion Chromatography Method
The ion chromatography method is a common technique used for the determination of nitrate and nitrite in water samples. The following is an overview of the procedure:
1. Sample Preparation: Water samples are collected and prepared for analysis.
2. Ion Exchange Column: Samples are passed through an ion exchange column, which separates ions based on their charge and size.
3. Detector: Ions are detected using a conductivity detector or UV-VIS spectrophotometer.
4. Data Analysis: Results are analyzed using specialized software.
Spectrophotometry Method
The spectrophotometry method is another common technique used for the determination of nitrate and nitrite in water samples. The following is an overview of the procedure:
1. Sample Preparation: Water samples are collected and prepared for analysis.
2. Spectrophotometer: Samples are analyzed using a UV-VIS spectrophotometer.
3. Calibration: Instruments are calibrated using certified standards.
4. Testing: Samples are tested according to established protocols.
Reporting Requirements
Results from the ISO 7887 test must be reported in accordance with regulatory requirements. The following are some examples of reporting requirements:
Conclusion
The ISO 7887 test is a critical aspect of water quality testing, providing accurate and reliable results for the determination of nitrate and nitrite in water samples. Laboratories that provide this service must demonstrate compliance with national and international standards, ensuring the accuracy, reliability, and validity of test results.
