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GB/T 25836-2010: Rapid determination method of micro-hardness
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| GB/T 25836-2010 | English | 139 |
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Rapid determination method of micro-hardness
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GB/T 25836-2010
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Basic data | Standard ID | GB/T 25836-2010 (GB/T25836-2010) | | Description (Translated English) | Rapid determination method of micro-hardness | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | F24 | | Classification of International Standard | 27.100 | | Word Count Estimation | 6,650 | | Date of Issue | 2010-12-23 | | Date of Implementation | 2011-05-01 | | Quoted Standard | GB/T 6903, GB/T 6907 | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 10 of 2010 (No. 165 overall) | | 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 softened water, H-type cation exchanger water, boiler feed water, condensate, water and other water samples hardness measurement method. This standard applies to hardness of water samples (one- to two Ca2 + and Mg2 + 2 one- meter) is 0. 5��mol/L ~ 200��mol/L content. | GB/T 25836-2010: Rapid determination method of micro-hardness---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.
Rapid determination method of micro-hardness
ICS 27.100
F24
National Standards of People's Republic of China
Rapid Determination of Micro Hardness
Issued on. 2010-12-23
2011-05-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard was drafted in accordance with GB/T 1.1-2009 given rules.
This standard is proposed and managed by the China Electricity Council.
This standard is drafted by. Xi'an Thermal Power Research Institute Co., Ltd., North China Electric Power Research Institute Co., Ltd.
The main drafters of this standard. Huangshan Feng, Wang should be high, Lee Tian, \u200b\u200bGong Lihua, Shi Qinglin, Sun Wei Wei, Wang Guang beads.
Rapid Determination of Micro Hardness
1 Scope
This standard specifies the demineralized water, H-type cation exchanger water, boiler feed water, condensate water determination in water samples with hardness.
This standard applies to the hardness of water samples (1
2Ca
2 and 1
2Mg
2 meter) of 0.5μmol/L ~ 200μmol/L measured content.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 6903 boiler water and cooling water General Analysis
GB/T 6907 boiler water and cooling water analysis water sample collection methods
3 Method Summary
At a pH of 10.0 ± 0.1 in the aqueous solution, a micro hardness indicator), ethylenediamine tetraacetic acid disodium salt (abbreviated EDTA) standard
Quasi titration solution was titrated to a blue end. According to the consumption volume of EDTA standard titration solution, the water sample can be calculated hardness values.
1) Trace hardness indicator is the trade name of products offered by the Xi'an Thermal Power Research Institute Co., Ltd.
Water samples iron content of less than 1.0mg/L, the copper content is less than 0.05mg/L on the determination without interference. When the iron content in water samples is greater than
1.0mg/L, the copper content greater than 0.05mg/L, the indicator may be preceded by 2mL of L- cysteine \u200b\u200bhydrochloride solution (10g/L) and
2mL triethanolamine solution (14) to conduct joint masking eliminate interference.
4 Reagents and Instruments
4.1 Purity of Reagents should be consistent with GB/T 6903 regulations.
4.2 Reagent water. Reagent Ⅱ water level should be consistent with GB/T 6903 regulations.
4.3 Buret. when the hardness of the water content of less than 50.0μmol/L when using the smallest sub-scale of not more than 0.05mL microburette; when
When using the content of the water hardness of greater than or equal to 50.0μmol/L is the smallest sub-scale 0.1mL burette.
4.4 Sodium hydroxide solution (40g/L).
4.5 hydrochloric acid solution (14).
4.6 borax buffer solution. Weigh 40g borax (Na2B4O7 · 10H2O), 10g of sodium hydroxide dissolved in reagent water and dilute to
1L. Stored in plastic bottles.
4.7 Calcium standard solution [c1 = 0.1000mmol/L]. Weigh accurately under bake at 110 ℃ 2h and cooled in the dryer baseline calcium carbonate
(CaCO3) 1.0009g, 15mL dissolved in hydrochloric acid solution (4.5) and quantitatively transferred to a 1L volumetric flask, dilute to volume with reagent water. again
This standard solution 10.00mL to draw 1L volumetric flask, mix, and dilute to volume with reagent water.
4.8 Micro Hardness indicator solution. Weigh Trace hardness indicator 2.0g, was added 5mL reagent water, stir, then add 80mL triethanolammonium
Amine and 15mL of anhydrous ethanol, stir, stored in brown bottles. Validity of ≤30 days.
4.9 EDTA standard titration solution [c (EDTA) = 0.5mmol/L] preparation and calibration
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