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GB/T 6904-2008 English PDF

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Q: Should I purchase the latest version GB/T 6904-2008?

Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 6904-2008 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.

US$149.00 · In stock
Delivery: <= 2 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 6904-2008: Water used in industrial circulating cooling system and boiler -- Determination of pH
Status: Valid

GB/T 6904: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 6904-2008	149	Add to Cart	2 days	Water used in industrial circulating cooling system and boiler -- Determination of pH	Valid
GB/T 6904.1-1986	199	Add to Cart	2 days	Methods for analysis of water for boiler and for cooling--The determination of pH--The glass electrode method	Obsolete

Similar standards

GB/T 6913 GB/T 6903 GB/T 6907

Basic data

Standard ID: GB/T 6904-2008 (GB/T6904-2008)
Description (Translated English): Water used in industrial circulating cooling system and boiler -- Determination of pH
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G76
Classification of International Standard: 71.040.40
Word Count Estimation: 5,583
Date of Issue: 2008-04-01
Date of Implementation: 2008-09-01
Older Standard (superseded by this standard): GB/T 15893.2-1995; GB/T 6904.1-1986; GB/T 6904.3-1993
Quoted Standard: GB/T 603; GB/T 6682
Regulation (derived from): National Standard Approval Announcement 2008 No.5 (Total No.118)
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 method for measuring industrial circulating cooling water and boiler water of pH. This standard applies to water and boiler water pH value was measured in the range of 0 to 14 industrial cooling. This standard also applies to natural water, sewage, boiler feed water, and measuring the pH of pure water, demineralized water.

GB/T 6904-2008: Water used in industrial circulating cooling system and boiler -- 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 used in industrial circulating cooling system and boiler. Determination of pH ICS 71.040.40 G76 National Standards of People's Republic of China Replacing GB/T 15893.2-1995, GB/T 6904.1-1986, GB/T 6904.3-1986 Industrial circulating cooling water and boiler Posted 2008-04-01 2008-09-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard also replace the GB/T 15893.2-1995 "Industrial circulating cooling water - Determination of pH potentiometric method", GB/T 6904.1- 1986 "boiler water and cooling water analysis pH glass electrode measuring method" and GB/T 6904.3-1986 "boiler water and cold But water analysis measurement method for pure water pH glass electrode method. " This standard GB/T 15893.2-1995, GB/T 6904.1-1986 and GB/T 6904.3-1986 merged. This standard and GB/T 15893.2-1995, GB/T 6904.1-1986 and GB/T 6904.3-1986 compared to the technical content There was no difference. 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. Tianjin Chemical Engineering Research and Design Institute. The main drafters of this standard. Shaohong Qian, Li Lin, Bai Ying. This standard replaces the standard release case. --- GB/T 15893.2-1995; --- GB/T 6904.1-1986; --- GB/T 6904.3-1986. Industrial circulating cooling water and boiler

1 Scope

This standard specifies the method for the determination of industrial circulating cooling water and boiler water of pH. This standard applies to industrial cooling water and boiler water pH values \u200b\u200bmeasured in the range of 0 to 14, this standard also applies to natural Water, sewage, except pH brine, boiler feed water and pure water measurement.

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 6682-1992, neq ISO 3696. 1987) Principle 3 A predetermined indicator electrode and a reference electrode immersed in the same test solution into a primary battery, pH of the solution related to its force. through Measuring the electromotive force of the original pH of the solution can be derived.

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. Impurity standard solution, test preparation and products required, in the absence of special note, prepared according to GB/T 603's. Oxalate 4.1 standard buffer solution. Ba [KH3 (C2O4) 2 · 2H2O] = 0.05mol/L. Weigh 12.61g Sihcao potassium dissolved carbon dioxide-free water and dilute to 1000mL. Tartrate 4.2 standard buffer solution. a saturated solution. At 25 ℃, with no excess carbon dioxide dissolved in water (about 75g/L), potassium hydrogen tartrate is shaken vigorously with a saturated solution thereof was prepared. Standard 4.3 phthalate buffer. Ba (C6H4CO2HCO2K) = 0.05mol/L. Weigh 10.24g 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 3.39g and 3.53g potassium dihydrogen phosphate, disodium hydrogen phosphate-free carbon dioxide dissolved in water and diluted to 1000mL. Phosphodiesterase Disodium hydrogen phosphate and potassium hydrogen required in advance (120 ± 10) ℃ drying 2h. Standard 4.5 borate buffer solution. Ba (Na2B4O7 · 10H2O) = 0.01mol/L. Weigh 3.80g sodium tetraborate decahydrate dissolved carbon dioxide-free water, diluted to 1000mL. Calcium hydroxide 4.6 standard buffer solution. a saturated solution. At 25 ℃, carbon dioxide-free water for preparing a saturated solution of calcium hydroxide. Storage should prevent carbon dioxide into the air. one Once turbidity should be discarded reconfiguration. Different temperatures of the standard buffer solution of pH values \u200b\u200bare shown in Table 1. ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 6904-2008_English be delivered?

Answer: Upon your order, we will start to translate GB/T 6904-2008_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 2 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 6904-2008_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 6904-2008_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.

Question 5: Should I purchase the latest version GB/T 6904-2008?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 6904-2008 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.