GB/T 37667-2019 in English

GB/T 37667—2019 Standard Overview

National Standard of the People's Republic of China GB/T 37667—2019 "Determination of Iron, Calcium, Magnesium, Potassium, Sodium, Manganese, Phosphorus, Aluminum, Titanium, Barium and Strontium in Coal Ash - Inductively Coupled Plasma Atomic Emission Spectrometry" specifies the method of determining multiple elements in coal ash by inductively coupled plasma atomic emission spectrometry (ICP-AES). This standard is applicable to the analysis of coal, coke and coal mill stone, and is an important detection basis for the coal industry.

Background of Standard Formulation and Technological Evolution

With the improvement of product quality requirements in the coal industry, the demand for accurate determination of multiple elements in coal ash is becoming increasingly urgent. Traditional chemical methods are gradually replaced due to low efficiency and large errors. ICP-AES has become the first choice due to its high sensitivity and the advantages of simultaneous detection of multiple elements.

Comparative analysis of standard frameworks

Instrument and reagent requirements

Test steps and quality control

The test process includes ash sample preparation, sample solution preparation, blank solution preparation, standard series solution preparation and ICP-AES determination. To ensure data accuracy, the following key points should be noted:

• Sample weighing accuracy to 0.0002g.
• Ashing temperature is controlled at 815±10℃.
• Blank test is performed at least once for each batch of samples.

Result calculation and precision

The content of each component in coal ash is calculated according to formula (1), and the results are rounded according to GB/T 483 requirements. The standard stipulates the repeatability limit and reproducibility limit of different oxides to ensure data reliability.

Implementation Suggestions

1. The laboratory should be equipped with instruments and equipment that meet the requirements and calibrate them regularly.

2. Operators must undergo professional training and be familiar with the ICP-AES operating procedures.

3. The sample pretreatment process should be strictly controlled to avoid the introduction of interference factors.

4. Regularly verify standard solutions and quality control samples to ensure measurement accuracy.