GB/T 22592-2008 English PDF

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GB/T 22592-2008: Water treatment reagent -- General rules for the determination of pH
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 22592-2008	139	Add to Cart	3 days	Water treatment reagent -- General rules for the determination of pH	Valid

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Basic data

Standard ID: GB/T 22592-2008 (GB/T22592-2008)
Description (Translated English): Water treatment reagent -- General rules for the determination of pH
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G76
Classification of International Standard: 71.040.40
Word Count Estimation: 6,611
Date of Issue: 2008-12-23
Date of Implementation: 2009-09-01
Quoted Standard: GB/T 603; GB/T 6682
Adopted Standard: ISO 10523-1994, NEQ
Regulation (derived from): National Standard Approval Announcement 2008 No.21 (Total No.134)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the determination of the pH of the water treatment agent potential method General. This standard applies to the determination of pH water solution in the range of 0 to 14.

GB/T 22592-2008: Water treatment reagent -- General rules for the determination of pH

---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.
Water treatment reagent. General rules for the determination of pH ICS 71.040.40 G76 National Standards of People's Republic of China (ISO 10523.1994, Waterquality-DeterminationofpH, NEQ) Posted 2008-12-23 2009-09-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This corresponds to the standard ISO 10523.1994 "Water quality pH measurement" (in English), and ISO 10523.1994 for the degree of consistency Non-equivalent. The standard proposed by China Petroleum and Chemical Industry Association. This standard by the National Standardization Technical Committee of Chemical Water Treatment Chemicals Branch (SAC/TC63/SC5) centralized. This standard is drafted by. CNOOC Tianjin Chemical Research & Design Institute, Tianjin Pacific Technology Co., Ltd. The main drafters of this standard. Bai Ying, Li Lin, Shao Hongqian.

1 Scope

This standard specifies the determination of the water treatment agent of pH potentiometric method General method. This standard applies to the determination of pH of water solution in the range of 0 to 14.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 603 chemical reagent test method Preparations of articles (GB/T 603-2002, ISO 6353-1 with. 1982, NEQ) GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-2008, ISO 3696. 1987, MOD) Principle 3 A predetermined indicator electrode and a reference electrode immersed in the same test solution into a primary battery, pH value of the solution related to its force. PH of the solution can be obtained by measuring the electromotive force of the original.

4 Reagents and materials

This standard reagents and water, unless otherwise specified, shall use analytical reagent and in line with GB/T 6682 three water requirements. Test preparation and the desired product, in the absence of special note, according to GB/T 603 of the preparation. Oxalate 4.1 standard buffer solution. Ba [KH3 (C2O4) 2 · 2H2O] = 0.05mol/L. Weigh 12.71g Sihcao potassium [KH3 (C2O4) 2 · 2H2O] no carbon dioxide dissolved in water and diluted to 1000mL. Tartrate 4.2 standard buffer solution. a saturated solution. At 25 ℃, carbon dioxide-free water to dissolve an excess of potassium bitartrate (about 75g/L) and vigorously shaken with a saturated solution thereof was prepared. Standard 4.3 phthalate buffer. Ba (C6H4CO2HCO2K) = 0.05mol/L. Weigh 10.21g advance to (110 ± 5) ℃ drying 1h of potassium hydrogen phthalate, no carbon dioxide dissolved in water and diluted to 1000mL. Standard 4.4 phosphate buffer solution. Ba (KH2PO4) = 0.025mol/L; Ba (Na2HPO4) = 0.025mol/L. Weigh in advance (120 ± 10) ℃ drying 2h 3.39g of potassium dihydrogen phosphate and disodium hydrogen phosphate 3.53g dissolved carbon dioxide-free water And diluted to 1000mL. Standard 4.5 borate buffer solution. Ba (Na2B4O7 · 10H2O) = 0.01mol/L. Weigh 3.80g sodium tetraborate (Na2B4O7 · 10H2O), no carbon dioxide is dissolved in water and diluted to 1000mL. Placed in polyethylene Ene plastic bottles sealed. Storage should prevent carbon dioxide into the air. Calcium hydroxide 4.6 standard buffer solution. a saturated solution. At 25 ℃, with a saturated solution of carbon dioxide-free water prepared calcium hydroxide. Ba concentration of calcium hydroxide solution [1/2Ca (OH) 2] should Between 0.0400mol/L ~ 0.0412mol/L. Storage should prevent carbon dioxide into the air. Once cloudiness should be discarded Reassortment. NOTE. To ensure the accuracy of pH values \u200b\u200babove pH standard buffer solution must use a reference reagent preparation. ......

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