ASTM D8083-16(2023) PDF
Standard Test Method for Total Nitrogen, and Total Kjeldahl Nitrogen (TKN) by Calculation, in Water by High Temperature Catalytic Combustion and Chemiluminescence Detection
Standard Test Method for Total Nitrogen, and Total Kjeldahl Nitrogen (TKN) by Calculation, in Water by High Temperature Catalytic Combustion and Chemiluminescence Detection
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 9
- Дата публикации:
- 1 января 2023 г.
- Издание:
- D8083
- ICS:
- 13.060.50
SIGNIFICANCE AND USE 5.1 This test method is used for determination of the total or dissolved nitrogen content of water from a variety of natural, domestic, and industrial sources. In its most common form, this test method is used to measure nitrogen as a means of monitoring nutrient pollutant in industrial wastewater, domestic wastewater, and ambient water. These measurements may also be used in monitoring waste treatment processes. 5.2 This test method measures oxidized ammonia and organic nitrogen (as nitrate) and soluble nitrate simultaneously, subtracting the nitrate + nitrite value from a non-digested sample gives total Kjeldhal nitrogen (TKN). When using this test method: where: TN = total nitrogen, and TKN = total Kjeldahl nitrogen. SCOPE 1.1 This test method covers the determination of total nitrogen (TN) and total dissolved nitrogen (TDN) in surface water, seawater, groundwater, wastewater, and wastewater effluents in the range from 0.2 mg/L N to 10 mg/L N. Concentrations from 10 mg/L to 500 mg/L are possible when used in conjunction with manual or automatic dilution, or automatic injection of less sample volume. The EPA 40 CFR Part 136 Appendix B Method Detection Limit (MDL) is 0.05 mg/L N. Higher concentrations may be determined by sample dilution. Lower concentrations may be possible by injecting larger sample volumes. Follow the manufacturer’s instructions. 1.2 The sample is injected onto a platinum catalyst heated at ≥720 °C. The sample converts into a gaseous phase and is forced through a layer of catalyst ensuring conversion of all nitrogen containing compounds to nitrogen oxide (NO). Reaction with ozone converts the NO to an exited NO2. As the excited NO2 returns to the ground state, it emits radiation that is measured photo-electrically. 1.3 Total and dissolved organic carbon analysis by Test Method D7573 can be analyzed at the same time on the same sample simultaneously using a properly equipped analyzer. (See Appendix X1 for an example of simultaneous TOC data.) 1.4 This test method quantitatively recovers nitrogen from a large range of organic and inorganic nitrogen compounds (see Table 1 and Table 2). The test method does not measure nitrogen gas (N2). It is the user's responsibility to ensure the validity of this test method for waters of untested matrices. 1.5 This test method is applicable only to nitrogenous matter in the sample that can be introduced into the reaction zone. The syringe needle or injector opening size generally limits the maximum size of particles that can be so introduced. Optional automatic sample homogenization may be used. 1.6 This test method is performance based. You may make modifications that improve the test method’s performance but do not change the oxidation or detection technique. 1.7 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.9 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Abstract
Overview
ASTM D8083-16(2023) is the internationally recognized standard test method for the determination of total nitrogen (TN) and total Kjeldahl nitrogen (TKN) in water. Developed by ASTM International, this standard utilizes high temperature catalytic combustion followed by chemiluminescence detection to accurately quantify nitrogen content in various water samples-including surface water, seawater, groundwater, industrial and domestic wastewater, and their effluents. The method supports measurement ranges from 0.2 mg/L N to 10 mg/L N, with possibilities for higher concentrations through dilution and detection of low levels down to 0.05 mg/L N.
By providing a robust analytical framework, ASTM D8083 is used extensively for compliance monitoring, environmental assessments, and quality control in water treatment processes.
Key Topics
- Total Nitrogen (TN) Measurement: Quantifies all nitrogen forms-organic and inorganic-by converting them to nitrogen oxide (NO) at ≥720 °C, which is then detected via chemiluminescence.
- Total Kjeldahl Nitrogen (TKN) by Calculation: TKN is calculated by subtracting nitrate and nitrite values from TN, providing a vital metric for organic nitrogen assessment.
- Applicability: Suitable for samples such as surface water, groundwater, seawater, municipal and industrial wastewater, and respective effluents.
- Performance-Based Approach: The method allows method modifications to improve analytical performance provided the oxidation and detection steps remain unchanged.
- Interference Control: Acid preservation, sample homogenizing, and particle size control are critical for ensuring reliable results.
- Simultaneous TOC Measurement: When properly equipped, the method enables concurrent determination of total organic carbon (TOC), enhancing laboratory efficiency.
Applications
- Environmental Monitoring: Essential for tracking nutrient pollution and eutrophication in lakes, rivers, and coastal waters.
- Wastewater Compliance: Used in industrial and municipal treatment plants to monitor and control nitrogen discharges according to regulatory requirements.
- Process Optimization: Supports water treatment facilities in process control and efficiency measurement by monitoring changes in nitrogen content.
- Research and Assessment: Facilitates academic and environmental research into nitrogen cycling and its ecological impacts.
- Quality Control: Offers reliable nitrogen quantification for laboratories conducting routine analyses or validating new water sources.
Related Standards
The methodology described in ASTM D8083 is complemented by several other ASTM water analysis standards, facilitating comprehensive water quality assessment:
- ASTM D1129: Terminology Relating to Water
- ASTM D1193: Specification for Reagent Water
- ASTM D1426: Test Methods for Ammonia Nitrogen in Water
- ASTM D3590: Test Methods for Total Kjeldahl Nitrogen in Water
- ASTM D3867: Test Methods for Nitrite-Nitrate in Water
- ASTM D4327: Test Method for Anions in Water by Suppressed Ion Chromatography
- ASTM D7573: Test Method for Total Carbon and Organic Carbon in Water by High Temperature Catalytic Combustion and Infrared Detection
Practical Value
Implementing ASTM D8083-16(2023) improves the reliability and comparability of nitrogen measurements in diverse water matrices. Its performance-based flexibility supports adaptation to new instrumentation and emerging water types, while its detailed quality control steps help laboratories maintain regulatory and accreditation standards. By enabling simultaneous TN, TKN, and TOC analysis, this standard streamlines laboratory workflows and strengthens data integrity for critical environmental and industrial applications.
Keywords: total nitrogen, total Kjeldahl nitrogen, TKN, ASTM D8083, water quality, high temperature catalytic combustion, chemiluminescence detection, environmental compliance, water analysis, wastewater monitoring, nutrient pollution.
Технические детали
- Технический комитет
- D19 - Water
- SKU
- ASTM D8083-16(2023)
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