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HYT263-2018 English PDF

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HYT263-2018: Determination of dissolved nitrous oxide in seawater. Headspace equilibrium gas chromatography method
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HY/T 263-2018English229 Add to Cart 3 days [Need to translate] Determination of dissolved nitrous oxide in seawater. Headspace equilibrium gas chromatography method Valid HY/T 263-2018

PDF similar to HYT263-2018


Standard similar to HYT263-2018

GB/T 33584.3   GB/T 33584.2   GB 18420.1   HY/T 260   HY/T 262   HY/T 259   

Basic data

Standard ID HY/T 263-2018 (HY/T263-2018)
Description (Translated English) Determination of dissolved nitrous oxide in seawater. Headspace equilibrium gas chromatography method
Sector / Industry Marine Industry Standard (Recommended)
Classification of Chinese Standard Z17
Classification of International Standard 07.060; 13.060
Word Count Estimation 10,174
Date of Issue 2018-07-30
Date of Implementation 2018-11-01
Regulation (derived from) Ministry of Natural Resources Announcement No. 30 of 2018
Issuing agency(ies) Ministry of Natural Resources of the People's Republic of China
Summary This standard specifies the principle, analysis steps and calculation of the method for the determination of dissolved nitrous oxide (N2O) in seawater by headspace equilibrium-gas chromatography. This standard is applicable to the determination of dissolved N2O concentration in offshore, oceanic and polar seawater. The measurement range is 5 nmol��L^(-1)��300 nmol��L^(-1).

HYT263-2018: Determination of dissolved nitrous oxide in seawater. Headspace equilibrium gas chromatography method


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Determination of dissolved nitrous oxide in seawater.Headspace equilibrium gas chromatography method ICS 07.060; 13.060 Z17 People's Republic of China Marine Industry Standard Determination of dissolved nitrous oxide in seawater Headspace balance-gas chromatography Published on.2018-07-30 2018-11-01 implementation Ministry of Natural Resources of the People's Republic of China

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard was proposed by the Ministry of Natural Resources of the People's Republic of China This standard is under the jurisdiction of the National Marine Standardization Technical Committee (SAC/TC283). This standard was drafted. National Marine Environmental Monitoring Center, Yantai Marine Environmental Monitoring Center Station of the State Oceanic Administration. Drafters of this standard. Zhao Huade, Yan Kunpeng, Wang Juying, Wang Qin, Zheng Nan, Xu Xuemei. Determination of dissolved nitrous oxide in seawater Headspace balance-gas chromatography

1 Scope

This standard specifies the principle, analysis steps and results of the determination of dissolved nitrous oxide (N2O) in seawater by headspace equilibrium-gas chromatography. Calculation. This standard applies to the determination of dissolved N2O concentration in offshore, ocean and polar seawater, the measurement range is 5nmol·L-1~ 300 nmol·L-1.

2 Terms and definitions

The following terms and definitions apply to this document. 2.1 Dissolved nitrous oxide dissolvednitrousoxide The amount of N2O gas dissolved per liter of seawater. Note. The unit is nanomolar per liter (nmol·L-1). 2.2 Headspace balance headspaceequilibrium In a closed container, a gas-liquid system consisting of a seawater sample and a gas that does not affect the measurement result is formed, and the gas to be tested is formed A method of achieving equilibrium in the gas-liquid two phases. 2.3 Head air headheadspacegas In a closed vessel, the gas-liquid two phases reach the equilibrium portion of the gas phase in the headspace.

3 Principle of the method

Based on Dalton's gas partial pressure law and Henry's law, at room temperature, a gas composed of seawater samples and gases that do not affect the measurement results are formed - The liquid-tight system is allowed to stand after shaking, so that the dissolved N2O in seawater reaches the distribution equilibrium between the gas-liquid two phases, and then determined by gas chromatography. The concentration of N2O in the headspace gas, and the concentration of dissolved N2O in the seawater sample is calculated according to the gas-liquid two-phase volume.

4 reagents and materials

Warning - mercury chloride (HgCl2) is highly toxic, should be handled carefully, avoid direct contact, waste liquid sulfur treatment Only deionized water or equivalent pure water was used in the analysis unless otherwise stated. 4.1 Hydrochloric acid solution (2 mol·L-1)..200 mL of concentrated hydrochloric acid (analytical grade, ρ=1.19 g·mL-1) was dissolved in 1 L of water. 4.2 13× molecular sieve. first grade, spherical type, diameter 2.0mm~2.8mm. 4.3 Silica gel. analytically pure, spherical, 4mm~8mm in diameter. 4.4 Argon Methane Gas. A mixed gas containing 5% methane and 95% argon, purified and dried by 13× molecular sieve (4.2) and silica gel (4.3). 4.5 Nitrogen (purity greater than or equal to 99.999%). Bottled with high purity nitrogen, purified and dried by 13× molecular sieve (4.2) and silica gel (4.3).

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