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HYT262-2018 English PDF

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US$329.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
HYT262-2018: Determination of dissolved methane in seawater - Headspace equilibrium gas chromatography method
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
HY/T 262-2018	329	Add to Cart	3 days	Determination of dissolved methane in seawater - Headspace equilibrium gas chromatography method	Valid

Similar standards

GB/T 33584.3 GB/T 33584.2 GB 18420.1 HY/T 260 HY/T 263 HY/T 259

Basic data

Standard ID: HY/T 262-2018 (HY/T262-2018)
Description (Translated English): Determination of dissolved methane 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: 14,190
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

HYT262-2018: Determination of dissolved methane in seawater - Headspace equilibrium gas chromatography method

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Determination of dissolved methane in seawater - Headspace equilibrium gas chromatography method ICS 07.060; 13.060 Z17 People's Republic of China Marine Industry Standard Determination of dissolved methane 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, Department of Ecological Environment Protection of the State Oceanic Administration, Nanhai Standard Measurement of the State Oceanic Administration center. The main drafters of this standard. Yan Kunpeng, Chi Zhenghao, Wang Juying, Zhao Huade, Xu Xuemei, Ying Peiyu, Zheng Nan, Huo Cheng. Determination of dissolved methane in seawater Headspace balance-gas chromatography

1 Scope

This standard specifies the principle, analysis steps and results of the determination of dissolved methane (CH4) in seawater by headspace equilibrium-gas chromatography. Calculation. This standard is applicable to the determination of dissolved CH4 concentration in seawater of offshore waters and estuaries. The measurement range is 2nmol·L-1~ 500 nmol·L-1.

2 Terms and definitions

The following terms and definitions apply to this document. 2.1 Dissolved methane dissolvedmethane The amount of CH4 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 CH4 in seawater reaches the distribution equilibrium between the gas-liquid two phases, and then determined by gas chromatography. The concentration of CH4 in the headspace gas, and the concentration of dissolved CH4 in the seawater sample is calculated based on 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 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 Hydrogen (purity greater than or equal to 99.999%). hydrogen produced by bottled high purity hydrogen or hydrogen generator, passed through 13× molecular sieve (4.2) and Silica gel (4.3) is purified and dried. ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of HYT262-2018_English be delivered?

Answer: Upon your order, we will start to translate HYT262-2018_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of HYT262-2018_English with my colleagues?

Answer: Yes. The purchased PDF of HYT262-2018_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.