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GB/T 23947.1-2009 English PDF (GBT23947.1-2009)
GB/T 23947.1-2009 English PDF (GBT23947.1-2009)
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GB/T 23947.1-2009: Inorganic chemicals for industrial use -- General method for determination of arsenic -- Part 1: Silver diethyldithiocarbamate photometric method
GB/T 23947.1-2009
Inorganic chemicals for industrial use General method for determination of arsenic Part 1. Silver diethyldithiocarbamate photometric method
ICS 71.060.01
G10
National Standards of People's Republic of China
Inorganic chemical products for the determination of arsenic
Part 1 General Method. diethyldithiocarbamate
Carbamate silver spectrophotometry
(ISO 2590. 1973, MOD)
Posted 2009-06-02
2010-02-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
GB/T 23947 "General method for inorganic chemical products Determination of Arsenic" is divided into two parts.
--- Part 1. diethyl dithiocarbamate spectrophotometry silver;
--- Part 2. Gutzeit method.
This section GB/T Part of 123,947.
The partial modification of the use of ISO 2590. 1973 "General Method of arsenic determination diethyl dithiocarbamate spectrophotometric silver" (English
Chinese Version).
This section according to ISO 2590. 1973 draft. The standard terms and provisions correspond to international standards.
Since the ISO 2590. 1973 international standard reference has been annulled, the use of this standard in ISO 2590. 1973 when modified. Skill
Operation of difference is not a reference to international standards has been abolished.
For ease of use, this section made the following editorial changes.
--- In order to be consistent with standards of inorganic chemical products, an increase in the standard name "inorganic chemical product";
--- Delete foreword international standards;
--- Use the "standard" instead of "this International Standard";
"." --- With a decimal point instead of a comma as the decimal point, "";
--- International standard "Appendix" to "Appendix A";
--- Increase the informative Appendix B to direct use.
Appendix A of this section is normative appendix, Appendix B is an informative annex.
This part is proposed by the China Petroleum and Chemical Industry Association.
This part of the National Standardization Technical Committee chemical inorganic chemicals Club (SAC/TC63/SC1) centralized.
This part mainly drafted by. CNOOC Tianjin Chemical Research and Design Institute, Fluoride Chemicals Co., Ltd., Yunnan Province Chemical Research Institute,
Tianjin CIQ.
The main drafters of this section. Lu Siwei, Xu Jin Xue, Long Ping, Liu Shao from Lu Gang.
This section first release.
Inorganic chemical products for the determination of arsenic
Part 1 General Method. diethyldithiocarbamate
Carbamate silver spectrophotometry
1 Scope
This section GB/T 23942 specifies the general method for the determination of inorganic arsenic chemical products --- diethyl dithiocarbamate spectrophotometric silver
Spectrophotometry.
This method is applicable in all part of the test solution in the test solution or the determination of arsenic taken (As) content of 1μg ~ 20μg products.
Principle 2
Zinc in hydrochloric acid medium with the reduction of arsenic into arsine, then diethyl dithiocarbamate silver pyridine solution absorbed arsine. In the most
Great absorption wavelength (about 540nm) to purple color dispersed colloidal silver produced by photometric measurements. Formation of silver colloid responding party
Program are as follows.
AsH3 + 6Ag (DDTC) = 6Ag + 3H (DDTC) + As (DDTC) 3
3 Reagents
All reagents, particularly zinc should not contain arsenic or contain very small amounts of arsenic. The water used in the experiment should be distilled water or equivalent purity.
3.1 HCl. Density 1.19g/mL, the mass fraction of about 38%, or at a concentration of 12mol/L.
3.2 diethyl dithiocarbamate silver [Ag (DDTC)]. 5g L pyridine solution /.
Dissolving 1g diethyl dithiocarbamate silver in pyridine (density of about 0.980g/mL), the solution was diluted to with the same pyridine
200mL. In a sealed brown bottle stored in the dark, the solution was to use a period of two weeks.
3.3 arsenic standard solution. 0.100g/L.
Weigh 0.132g of arsenic trioxide (As2O3), accurate to 0.0001g, placed in an appropriate volume (eg 100mL) beaker with about
2mL50g/L aqueous sodium hydroxide solution to dissolve all transferred to a 1000mL volumetric flask, rinsing the beaker several times with water, and the washings were also transferred
The volumetric flask, dilute with water to volume, and mix.
This standard solution 1mL containing 100μg arsenic (As).
3.4 arsenic standard solution. 2.50mg/L.
Pipette 25.0mL arsenic standard solution (3.3), placed 1000mL volumetric flask, dilute to volume, and mix. This solution was prepared prior to use.
This standard solution 1mL containing 2.5μg arsenic (As).
3.5 Lead acetate cotton.
Dissolved in 250mL 50g Sanshui lead acetate [Pb (C2H3O2) 2 · 3H2O]. With this solution cotton wool soaked drain off excess
Solution and dried under vacuum at room temperature.
Store in airtight container.
3.6 KI solution. 150g/L.
15g potassium iodide dissolved in water and diluted to 100mL, and mix.
3.7 stannous chloride. hydrochloric acid solution.
With 25mL of water and 75mL of hydrochloric acid (3.1) was dissolved in a mixed solution of 40g of stannous chloride dihydrate (SnCl2 · 2H2O).
3.8 zinc particles. 0.5mm ~ 1mm or experimentally been shown to produce the same result zinc under specified test conditions of any shape (see
Appendix A).
4 Instrument
For glass container used for the measurement of arsenic use hot concentrated sulfuric acid wash (Proceed with caution), and then washed with water and dry completely.
Get Quotation: Click GB/T 23947.1-2009 (Self-service in 1-minute)
Historical versions (Master-website): GB/T 23947.1-2009
Preview True-PDF (Reload/Scroll-down if blank)
GB/T 23947.1-2009: Inorganic chemicals for industrial use -- General method for determination of arsenic -- Part 1: Silver diethyldithiocarbamate photometric method
GB/T 23947.1-2009
Inorganic chemicals for industrial use General method for determination of arsenic Part 1. Silver diethyldithiocarbamate photometric method
ICS 71.060.01
G10
National Standards of People's Republic of China
Inorganic chemical products for the determination of arsenic
Part 1 General Method. diethyldithiocarbamate
Carbamate silver spectrophotometry
(ISO 2590. 1973, MOD)
Posted 2009-06-02
2010-02-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
GB/T 23947 "General method for inorganic chemical products Determination of Arsenic" is divided into two parts.
--- Part 1. diethyl dithiocarbamate spectrophotometry silver;
--- Part 2. Gutzeit method.
This section GB/T Part of 123,947.
The partial modification of the use of ISO 2590. 1973 "General Method of arsenic determination diethyl dithiocarbamate spectrophotometric silver" (English
Chinese Version).
This section according to ISO 2590. 1973 draft. The standard terms and provisions correspond to international standards.
Since the ISO 2590. 1973 international standard reference has been annulled, the use of this standard in ISO 2590. 1973 when modified. Skill
Operation of difference is not a reference to international standards has been abolished.
For ease of use, this section made the following editorial changes.
--- In order to be consistent with standards of inorganic chemical products, an increase in the standard name "inorganic chemical product";
--- Delete foreword international standards;
--- Use the "standard" instead of "this International Standard";
"." --- With a decimal point instead of a comma as the decimal point, "";
--- International standard "Appendix" to "Appendix A";
--- Increase the informative Appendix B to direct use.
Appendix A of this section is normative appendix, Appendix B is an informative annex.
This part is proposed by the China Petroleum and Chemical Industry Association.
This part of the National Standardization Technical Committee chemical inorganic chemicals Club (SAC/TC63/SC1) centralized.
This part mainly drafted by. CNOOC Tianjin Chemical Research and Design Institute, Fluoride Chemicals Co., Ltd., Yunnan Province Chemical Research Institute,
Tianjin CIQ.
The main drafters of this section. Lu Siwei, Xu Jin Xue, Long Ping, Liu Shao from Lu Gang.
This section first release.
Inorganic chemical products for the determination of arsenic
Part 1 General Method. diethyldithiocarbamate
Carbamate silver spectrophotometry
1 Scope
This section GB/T 23942 specifies the general method for the determination of inorganic arsenic chemical products --- diethyl dithiocarbamate spectrophotometric silver
Spectrophotometry.
This method is applicable in all part of the test solution in the test solution or the determination of arsenic taken (As) content of 1μg ~ 20μg products.
Principle 2
Zinc in hydrochloric acid medium with the reduction of arsenic into arsine, then diethyl dithiocarbamate silver pyridine solution absorbed arsine. In the most
Great absorption wavelength (about 540nm) to purple color dispersed colloidal silver produced by photometric measurements. Formation of silver colloid responding party
Program are as follows.
AsH3 + 6Ag (DDTC) = 6Ag + 3H (DDTC) + As (DDTC) 3
3 Reagents
All reagents, particularly zinc should not contain arsenic or contain very small amounts of arsenic. The water used in the experiment should be distilled water or equivalent purity.
3.1 HCl. Density 1.19g/mL, the mass fraction of about 38%, or at a concentration of 12mol/L.
3.2 diethyl dithiocarbamate silver [Ag (DDTC)]. 5g L pyridine solution /.
Dissolving 1g diethyl dithiocarbamate silver in pyridine (density of about 0.980g/mL), the solution was diluted to with the same pyridine
200mL. In a sealed brown bottle stored in the dark, the solution was to use a period of two weeks.
3.3 arsenic standard solution. 0.100g/L.
Weigh 0.132g of arsenic trioxide (As2O3), accurate to 0.0001g, placed in an appropriate volume (eg 100mL) beaker with about
2mL50g/L aqueous sodium hydroxide solution to dissolve all transferred to a 1000mL volumetric flask, rinsing the beaker several times with water, and the washings were also transferred
The volumetric flask, dilute with water to volume, and mix.
This standard solution 1mL containing 100μg arsenic (As).
3.4 arsenic standard solution. 2.50mg/L.
Pipette 25.0mL arsenic standard solution (3.3), placed 1000mL volumetric flask, dilute to volume, and mix. This solution was prepared prior to use.
This standard solution 1mL containing 2.5μg arsenic (As).
3.5 Lead acetate cotton.
Dissolved in 250mL 50g Sanshui lead acetate [Pb (C2H3O2) 2 · 3H2O]. With this solution cotton wool soaked drain off excess
Solution and dried under vacuum at room temperature.
Store in airtight container.
3.6 KI solution. 150g/L.
15g potassium iodide dissolved in water and diluted to 100mL, and mix.
3.7 stannous chloride. hydrochloric acid solution.
With 25mL of water and 75mL of hydrochloric acid (3.1) was dissolved in a mixed solution of 40g of stannous chloride dihydrate (SnCl2 · 2H2O).
3.8 zinc particles. 0.5mm ~ 1mm or experimentally been shown to produce the same result zinc under specified test conditions of any shape (see
Appendix A).
4 Instrument
For glass container used for the measurement of arsenic use hot concentrated sulfuric acid wash (Proceed with caution), and then washed with water and dry completely.
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