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GB/T 14609-2008: Inspection of grain and oils -- Determination of copper, iron, manganese, zinc, calcium, magnesium in cereals and derived products by atomic absorption and flame spectrophotometry
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
GB/T 14609-2008	English	239	Add to Cart	3 days [Need to translate]	Inspection of grain and oils -- Determination of copper, iron, manganese, zinc, calcium, magnesium in cereals and derived products by atomic absorption and flame spectrophotometry
GB/T 14609-1993	English	239	Add to Cart	2 days [Need to translate]	Method for determination of Cu. Fe. Mn. Zn. Ca. Mg in cereals by atomic absorbtion spetrophotometry

GB/T 14609-2008: Inspection of grain and oils -- Determination of copper, iron, manganese, zinc, calcium, magnesium in cereals and derived products by atomic absorption and flame spectrophotometry

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Inspection of grain and oils. Determination of copper, iron, manganese, zinc, calcium, magnesium in cereals and derived products by atomic absorption and flame spectrophotometry ICS 67.060 B20 National Standards of People's Republic of China Replacing GB/T 14609-1993 Inspection of grain and grain products Determination of copper, iron, manganese, zinc, calcium, magnesium Flame Atomic Absorption Spectrometry Posted 2008-11-04 2009-01-20 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard replaces GB/T 14609-1993 "Grain of copper, iron, manganese, zinc, calcium, magnesium assay atomic absorption spectrometry." This standard compared with GB/T 14609-1993, the main technical differences are as follows. --- Modify the standard Chinese name changed to "Inspection of grain and grain products Flame copper, iron, manganese, zinc, calcium, magnesium Atomic Absorption Spectrometry "; --- Increasing the detection limit; --- Increased wet digestion and microwave digestion first two sample preparation methods. The standard proposed by the National Food Authority. This standard by the National Standardization Technical Committee OILS. This standard was drafted. Ministry of Agriculture, Grain Products Quality Supervision and Testing Center (Harbin). The main drafters of this standard. Chenguo You, Liu Feng, Du Yingqiu, Xiaobo Zhang, Cheng Aihua, Ma Yonghua, Wang Yuekai. This standard replaces the standards previously issued as follows. --- GB/T 14609-1993. Inspection of grain and grain products Determination of copper, iron, manganese, zinc, calcium, magnesium Flame Atomic Absorption Spectrometry

1 Scope

This standard specifies the principles of measurement and cereal products in copper, iron, manganese, zinc, calcium and magnesium by flame atomic absorption spectrometry, reagents, instruments And equipment, analytical step, the results of calculations and repeatability. This standard applies to the determination of grain and its products in copper, iron, manganese, zinc, calcium, magnesium and other elements. The detection limit. copper 0.6mg/kg, iron 2.4mg/kg, manganese 0.5mg/kg, zinc 0.4mg/kg, calcium 1.5mg/kg, Magnesium 0.7mg/kg.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 602 Determination of impurities in chemical reagents prepared standard solution (GB/T 602-2002, ISO 6353-1 with. 1982, Reagentsforchemicalanalysis-Part 1. Generaltestmethods, NEQ) GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-2008, ISO 3696. 1987, MOD) Principle 3 The sample was ashing or acid digestion, the sample to be tested so that all of the elements into the test solution and diluted to the appropriate concentration range. Import atom Absorption spectrometer, measuring the absorbance at each element characteristic wavelength within a certain range of concentration, absorbance is directly proportional to the content of the element, and Quantitative comparison of standard series.

4 Reagents

Unless otherwise indicated, the reagents should be of analytical grade, test water should be consistent with GB/T 6682 stipulated two of water. 4.1 hydrochloric acid. 4.2 nitrate. 4.3 perchloric acid. 4.4 Hydrogen peroxide (30%). 4.5 mixed acid digestion solution. nitric acid + perchloric acid (4 + 1, volume ratio). 4.6 0.5mol/L nitric acid solution. Measure 32mL of nitric acid (4.2), diluted with water to 1000mL. 4.7 50g/L lanthanum solution. Weigh 58.65g of lanthanum oxide (La2O, 99.99%), wetted with a small amount of water, was added 150mL of hydrochloric acid (4.1) were dissolved, and finally diluted with water to 1000mL. 4.8 copper, iron, manganese, zinc, calcium, magnesium single element standard stock solution. According to the provisions of GB/T 602 preparation, or by the National Research Center mention For; the concentration of 1000mg/L or 500mg/L. 4.9 copper, iron, manganese, zinc, calcium, magnesium series uses single element standard solution. According to the need of a single element standard stock solution (4.8) with nitric acid solution (4.6) stepwise diluted to the appropriate concentration (Table 2) of the standard working solution, which together formed the elements listed in Table 1 using a standard series solution. ...