GB/T 12687.3-2010Chemical analysis methods of rare earth nitrate for growth regulator for plant -- Part 3: Determination of the water insoluble matter content -- Gravimetry (English PDF)

Foreword

GB/T 12687 "analysis of rare earth nitrate plant growth regulator chemical" is divided into three parts.

--- Part 1. arsenic, mercury, lead, cadmium, chromium content - Inductively Coupled Plasma Mass Spectrometry;

--- Part 2. Determination of chlorine content;

--- Part 3. Determination of the amount of water insoluble gravimetric method.

This is Part 3.

This Part replaces GB/T 12687.8-1990 "Determination of water insoluble matter content of agricultural chemical analysis of rare earth nitrate gravimetric method." this section compared with the GB/T 12687.8-1990, have the following main changes.

--- Measurement range limit adjustment from the 1.0 to 0.3 percent;

--- Increasing the precision of the terms;

--- Increased quality assurance and control provisions;

--- Standard text made editorial changes.

This part of the National Standardization Technical Committee of rare earth (SAC/TC229) centralized.

This part by the Beijing Nonferrous Metal Research Institute, China Nonferrous Metals Industry Institute of Standards Metrology and Quality is responsible for drafting.

This section is Baotou Steel Rare Earth Hi-Tech Company, Jiangyin Jiahua Advanced Material Resources Co., Ltd. participated in the drafting.

1 Scope

GB/T 12687 provisions of this part of the rare earth nitrate plant growth regulator agents Determination of the amount of water insoluble.

This section applies to the determination of rare earth nitrate plant growth regulator agent in water-insoluble matter content. Measuring range. 0.10% to 0.30%.

2 Principle of the method

The sample is dissolved in water, insoluble matter was separated by filtration which is calculated by the amount of water insoluble mass value after drying.

3 Instrument

3.1 electric oven.200 °C ± 2 °C.

3.2 Analysis of balance. a sense of the amount of 0.1mg.

3.3 glass sand funnel (filter funnel acid). P16.

4 Sample

Weighing the sample immediately after the opening.

5 Step, Analysis

6 Calculation and presentation of analysis results

According to equation (1) calculate the water insoluble mass fraction (%).

w (water insoluble) = m1-m0m × 100 (1) where.

Mass m1 --- glass filter and water-insoluble material in grams (g);

m0 --- glass filter mass in grams (g);

M --- quality of the sample in grams (g).