GB/T 6276.3-2010Determination of ammonium hydrogen carbonate for industrial use -- Part 3: Sulphide content -- Visible turbidimetric method (English PDF)

Foreword

GB/T 6276 "industrial use - Determination of ammonium bicarbonate method" is divided into nine sections.

--- Part 1. ammonium bicarbonate content of acid-base titration;

--- Part 2. potentiometric titration of chloride content;

--- Part 3. sulphide content Visible turbidimetric method;

--- Part 4. sulphate content Visible turbidimetric method;

--- Part 5. ash content by weight method;

--- Part 6. iron content - Phenanthroline spectrophotometric method;

--- Part 7. arsenic content diethyl dithiocarbamate silver spectrophotometry;

--- Part 8. arsenic content Gutzeit method;

--- Part 9. heavy metal content Visible turbidimetric method.

This part of GB/T 36276 Part of.

This Part replaces GB/T 6276.3-1986 "industrial use - Determination of ammonium sulphide content Visible turbidimetric method." this portion of the GB/T 6276.3-1986 The main differences are.

--- Reagent solution, standard titration solution preparation and calibration methods such as the implementation of HG/T 2843 standard.

This part is proposed by the China Petroleum and Chemical Industry Association.

This part of the National Standardization Technical Committee centralized fertilizer and soil conditioner.

This section drafted by. National Fertilizer Quality Supervision and Inspection Center (Shanghai).

1 Scope

GB/T 6276 This section provides the use of visual turbidimetry industrial sulfide content of ammonium bicarbonate.

This section applies to the determination of ammonium sulfide content industry.

2 Normative references

The following documents contain provisions which, through reference to GB/T 6276 to the present, constitute provisions of this section. For dated reference documents Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this section.

HG/T 2843 fertilizer products for chemical analysis commonly used standard titration solution, standard solution, reagent solution and indicator solution Principle 3 Alkaline test solution was added to the lead-acid salt solution to produce a tan suspension sulfide and sulfide particles, turbidity standard determined by comparing Sulphide content.

4 Reagents and materials

The following part-corrosive and toxic reagents, the operator should be careful as splashed on skin, immediately wash with water, if not it should be treated immediately.

This part of the reagent solution and water, in the specifications and method of preparation is not specified, it shall comply with the provisions of HG/T 2843's.

4.1 sodium sulfide;

4.2 potassium hydroxide;

4.3 Lead acetate;

4.4 Potassium citrate;

4.5 chloroform;

4.6 Lead-acid potassium alkaline solution. Weigh 1g lead acetate, 3.4g potassium citrate, 70g of potassium hydroxide dissolved in water and diluted to 100mL;

4.7 sulfide standard solution, as S, 0.1mg/mL. Weigh 0.749g of sodium sulfide (Na2S · 9H2O), was dissolved in water and transferred to 1000mL volumetric flask, dilute to the mark, prepared prior to use;

4.8 sulfide standard solution, as S, 0.01mg/mL. accurately prepared by 10-fold dilution of sulfide standard solution (4.7).

5 Instruments

Typically laboratory instruments.

6 Step, Analysis

Preparation 6.1 turbidity standard Number of branches in 50mL colorimetric tube were added 0mL, 0.1mL, 0.3mL1.0mL sulfide standard solution (4.8), add water to Near 48mL, shake.