GB/T 35871-2018Inspection of grain and oils—Determination of calcium, potassium,magnesium, sodium, iron, phosphorus, zinc, copper, manganese, boron, barium, molybdenum, cobalt, chromium, lithium, strontium, nickel, sulfur, vanadium, selenium, rubidium contents in cereals and derived products—Inductively coupled plasma optical emission spectrometric method (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

This standard specifies the use of inductively coupled plasma-atomic emission spectrometry for the determination of calcium, potassium, magnesium, sodium, iron, phosphorus, zinc, copper, manganese in grains and their products.

Principles, reagents and materials, instruments and equipment, procedures, results calculations and representations of boron, bismuth, molybdenum, cobalt, chromium, lithium, ruthenium, nickel, sulfur, vanadium, selenium, and tellurium And its precision requirements.

This standard applies to calcium, potassium, magnesium, sodium, iron, phosphorus, zinc, copper, manganese, boron, antimony, molybdenum, cobalt, chromium, lithium, antimony, nickel, sulfur, vanadium, and Determination of selenium and tellurium content.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest version (including all amendments) applies to this document.

Preparation of GB/T 602 standard solution for determination of impurities in chemical reagents

GB/T 6682 Analysis Laboratory Water Specifications and Test Methods

JJG768 emission spectrometer verification procedures

3 Principle

After the sample is digested, the test solution is introduced into the plasma emission spectrometer and its intensity is measured at the corresponding element wavelength, using the standard curve method. Calculate the element content in the sample.

4 Reagents and materials

Unless otherwise specified, all the reagents used are of pure grade and the water is secondary water according to GB/T 6682.

4.1 Nitric acid. Subboiling or high purity reagents.

4.2 Perchloric acid.

4.3 Hydrogen peroxide (30%).

4.4 Nitric acid solution (5%). Accurately take 50 mL of nitric acid (4.1) slowly into appropriate amount of water and make up to 1000 mL with water.