GB/T 43098.1-2023Analysis of water treatment chemicals—Part 1: Determination of phosphorus (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

This document is Part 1 of GB/T 43098 "Analysis Methods for Water Treatment Agents". GB/T 43098 has released the following parts.

---Part 1: Determination of phosphorus content.

Introduction

In order to ensure the normal operation of the water system, save water, and reduce environmental pollution, it is necessary to add an appropriate amount of chemical treatment chemicals to the water.

Products to control corrosion, scaling, bacteria, algae, slime and other hazards caused by water supply equipment and water pipelines. With the development of water treatment technology, water quality The situation is becoming increasingly complex, and the types of water treatment agent products with different formulas are increasing.

GB/T 43098 aims to establish chemical analysis methods for water treatment agent products and is intended to consist of two parts.

---Part 1: Determination of phosphorus content. The purpose is to establish a method for determining phosphorus content.

---Part 2: Determination of arsenic, mercury, cadmium, chromium, lead, nickel and copper content by inductively coupled plasma mass spectrometry (ICP-MS). The purpose is To establish the determination method of arsenic, mercury, cadmium, chromium, lead, nickel and copper content.

Spectrophotometry has been widely used in phosphorus content in water treatment products due to its advantages of high sensitivity, good precision and high detection efficiency. determination.

Water treatment agent analysis method Part 1: Determination of phosphorus content Warning. The strong acid used in this document is corrosive. Avoid inhalation or contact with skin when using. If splashed on your body, rinse immediately with plenty of water Wash and seek medical attention immediately if severe.

1 Scope

This document describes a spectrophotometric method for the determination of phosphorus content in water treatment agents.

This document is applicable to the determination of orthophosphate, total inorganic phosphorus, total phosphorus and total organic phosphorus in water treatment compound chemicals. The range of phosphorus content determination Less than 10% (calculated as PO43-), water treatment compound chemicals with higher phosphorus content can be measured after dilution.

This document is not applicable to the determination of phosphorus content in iron-based water treatment agent products.

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document.

GB/T 602-2002 Preparation of standard solutions for determination of impurities in chemical reagents

GB/T 6682-2008 Specifications and test methods for water used in analytical laboratories

3 Terms and definitions

There are no terms or definitions to be defined in this document.

4 Reagents or materials

Unless otherwise specified, only use reagents of analytical grade or above.

4.1 Water. GB/T 6682-2008, Level 3.

4.2 Sulfuric acid solution. 1 3.

4.3 Sulfuric acid solution. 1 35.

4.4 Ammonium molybdate solution. 26g/L. Weigh 13g ammonium molybdate and dissolve it in 200mL water, add 0.5g antimony potassium tartrate and 120mL sulfur Acid, cool and dilute with water to 500mL, mix well. Stored in brown bottles, valid for 2 months.

4.5 Ascorbic acid solution. 20g/L. Weigh 10g of ascorbic acid and dissolve it in about 50mL of water, add 0.20g of disodium ethylenediaminetetraacetate and 8mL formic acid, dilute to 500mL with water, mix well. Store in brown bottles, placed in the refrigerator compartment, valid for 15 days.

4.6 Potassium persulfate solution. 40g/L. Weigh 20g of potassium persulfate and dissolve in 500mL of water, mix well. Stored in brown bottles, expiry date 1 month.

4.7 Phosphate standard stock solution (calculated as PO43-). 0.1mg/mL. Prepare according to the requirements of Table 1 in GB/T 602-2002, also Commercially available reagents are available.

4.8 Phosphate standard solution (calculated as PO43-). 0.02mg/mL. Pipette 20.00mL of phosphate standard stock solution and place it in 100mL.