GB/T 23375-2009 English PDF

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GB/T 23375-2009: Determination of copper, iron, zinc, calcium, magnesium and phosphorus content in vegetables and derived products
Status: Obsolete

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 23375-2009	319	Add to Cart	3 days	Determination of copper, iron, zinc, calcium, magnesium and phosphorus content in vegetables and derived products	Obsolete

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Basic data

Standard ID: GB/T 23375-2009 (GB/T23375-2009)
Description (Translated English): Determination of copper, iron, zinc, calcium, magnesium and phosphorus content in vegetables and derived products
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: B31
Classification of International Standard: 67.080.20
Word Count Estimation: 8,877
Date of Issue: 2009-03-28
Date of Implementation: 2009-10-01
Quoted Standard: GB/T 6682
Regulation (derived from): National Standard Approval Announcement 2009 No.3 (Total No.143)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the vegetables and their products in copper, iron, zinc, determination of phosphorus, magnesium, calcium. This standard applies to vegetables and their products in copper, iron, zinc, determination of phosphorus, calcium, magnesium. The limit of detection: copper, 0. 05mg/L, iron, 0. 10mg/L, zinc, 0. 05mg/L, Ca, 0. 25mg/L, magnesium, 0. 05mg/L, phosphorus, 0. 05mg/L. Linear range: Cu, 0. 1mg/L ~ 10mg/L, iron, 0. 2mg/L ~ 10mg/L, zinc, 0. 1mg/L ~ 2. 0mg/L, Ca, 0. 2mg/L ~ 20mg/L, magnesium, 0. 01mg/L ~ 1. 0mg/L, phosphorus, 0. 1mg/L ~ 10mg/L.

GB/T 23375-2009: Determination of copper, iron, zinc, calcium, magnesium and phosphorus content in vegetables and derived products

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Determination of copper, iron, zinc, calcium, magnesium and phosphorus content in vegetables and derived products ICS 67.080.20 B31 National Standards of People's Republic of China Vegetables and their products Determination of copper, iron, zinc, calcium, magnesium, phosphorus Posted 2009-03-28 2009-10-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard is proposed and managed by the People's Republic of China Ministry of Agriculture. This standard was drafted. the Ministry of Agriculture Food Quality Supervision and Testing Center (Jinan). The main drafters of this standard. Ren Fengshan, ZHANG Bing-chun, Wang Lei, Zhao Pingjuan, Zhu Aiguo, Teng Wei, Meng Lihong, Nie Yan, Gu Xiaohong. Vegetables and their products Determination of copper, iron, zinc, calcium, magnesium, phosphorus

1 Scope

This standard specifies the vegetables and derived products in copper, iron, zinc, calcium, magnesium, phosphorus determination. This standard applies to vegetables and derived products in copper, iron, zinc, calcium, magnesium, phosphorus determination. The detection limit. copper, 0.05mg/L; iron, 0.10mg/L; zinc, 0.05mg/L; calcium, 0.25mg/L; magnesium, 0.05mg/L; P, 0.05mg/L. Linear range. Cu, 0.1mg/L ~ 10mg/L; iron, 0.2mg/L ~ 10mg/L; zinc, 0.1mg/L ~ 2.0mg/L; Calcium, 0.2mg/L ~ 20mg/L; magnesium, 0.01mg/L ~ 1.0mg/L; P, 0.1mg/L ~ 10mg/L.

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. Laboratory use specifications and test methods GB/T 6682 Analysis Principle 3 The samples were acid digestion, atomic absorption spectrophotometer import, absorb 324.8nm respectively after the test solution of copper, iron, zinc, calcium, magnesium atomization, 248.3nm, 213.8nm, 422.7nm, 285.2nm resonance line in a certain concentration range, is proportional to the absorbance (value) to its concentration, and Quantitative comparison of standard series. The samples were acid digestion under acidic conditions combine to form ammonium molybdate phosphorus and ammonium phosphomolybdate. This compound was hydroquinone, sodium sulfite reduction Blue compound - molybdenum blue. Measured using a spectrophotometer at a wavelength of 660nm absorbance of the molybdenum blue (value), the absorbance (value) and phosphorus content Proportional to the standard series of quantitative comparison.

4 Reagents

Unless otherwise indicated, the use of analytical reagent and GB/T 6682 as specified in the analysis of two or more of water. Hydrochloric acid were weighed 50mL, 50mL water, and mix. Amount of nitric acid were 80mL, 20mL perchloric acid, and mix. Weigh 29.32g lanthanum oxide (La2O3) After 25mL water wet, was slowly added 125mL of hydrochloric acid (4.1) to dissolve the water transfer To 500mL volumetric flask, and dilute to volume. 4.4 sulfuric acid solution [φ (H2SO4) = 15%] Draw 15mL sulfuric acid was slowly added 80mL of water and mix, after cooling diluted with water to 100mL. Weigh 5g of ammonium molybdate [(NH4) 6Mo7O24 · 4H2O], diluted to 100mL with sulfuric acid solution (4.4). Weigh 20g of sodium sulfite (Na2SO3) was dissolved in 100mL of water. This solution is now with the existing, or else make the molybdenum blue solution turbid. ......

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