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GB/T 13082-1991 English PDF (GB/T 13082-2021 Newer Version)

GB/T 13082-1991 (GB/T13082-1991, GBT 13082-1991, GBT13082-1991)
Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 13082-2021English170 Add to Cart 0--9 seconds. Auto-delivery Determination of cadmium in feeds Valid GB/T 13082-2021
GB/T 13082-1991English70 Add to Cart 0--9 seconds. Auto-delivery Method for determination of cadmium in feeds Obsolete GB/T 13082-1991
Preview PDF: GB/T 13082-2021    Standards related to: GB/T 13082-1991

BASIC DATA
Standard ID GB/T 13082-1991 (GB/T13082-1991)
Description (Translated English) Method for determination of cadmium in feeds
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard B46
Classification of International Standard 65.12
Word Count Estimation 3,373
Date of Issue 1991/7/6
Date of Implementation 1992/4/1
Drafting Organization Central Laboratory of Huazhong Agricultural University
Summary This standard specifies the method for the determination of cadmium in feed. This standard applies to the determination of cadmium in feed.


GB 13082-1991 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA Method for determination of cadmium in feeds ISSUED ON: JULY 16, 1991 IMPLEMENTED ON: APRIL 01, 1992 Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Table of Contents 1  Subject Contents and Scope of Application ... 3  2  Principle ... 3  3  Reagents and Solutions ... 3  4  Instruments and Apparatuses ... 4  5  Preparation of Samples ... 4  6  Determination Procedures ... 4  6.1 Sample treatment ... 4  6.2 Drawing standard curve ... 5  6.3 Determination ... 5  7  Determination Results ... 5  7.1 Computing formula ... 5  7.2 Result expression ... 6  7.3 Repeatability ... 6  Additional Explanation: ... 6  Method for determination of cadmium in feeds 1  Subject Contents and Scope of Application  This standard specifies the method for determination of cadmium in feeds. This standard is applicable to the determination of cadmium in feeds. 2  Principle  Decompose the sample by dry ashing method. Under acid conditions and with the existence of potassium iodide, cadmium ions and iodine ions form a complex, which is then extraction-separated by methyl isobutyl ketone. Spray the organic phase on air-acetylene flame to atomize cadmium. Determine its absorbance in relation to the characteristic resonance-line 228.8 nm. Obtain the content of cadmium by comparing with the standard series. 3  Reagents and Solutions  Unless otherwise stated, all reagents used in this standard are analytically pure, and the water is redistilled water. 3.1 Nitric acid (GB 626), guaranteed. 3.2 Hydrochloric acid (GB 622), guaranteed. 3.3 Potassium iodide solution, 2 mol/L: weigh 332 g of potassium iodide (GB 1272), dissolve in water, and dilute with water to 1 000 mL. 3.4 Ascorbic acid solution, 5%: weigh 5 g of ascorbic acid (C6H8O6), dissolve in water, and dilute with water to 100 mL (prepare it before use). 3.5 Hydrochloric acid solution, 1 mol/L: weigh 10 mL of hydrochloric acid (3.2), add 110 mL of water and shake well. 3.6 Methyl isobutyl ketone [CH3COCH2CH(CH3)2, HG 3-1118]. 3.7 Cadmium standard stock solution: weigh 0.100 0 g of high purity cadmium metal (Cd, 99.99%), put into a 250 mL Erlenmeyer flask, add 10 mL of 1:1 nitric acid, dissolve completely by heating on an electric hot plate, dry up, take away and allow to cool down. Add 20 mL of 1:1 hydrochloric acid and 20 mL of water, dissolve by heating, take away and allow to cool down. Then, transfer to a 1 000 mL volumetric flask, dilute with water to the scale and shake well. Each milliliter of this solution is equivalent to 100 μg of cadmium. 3.8 Cadmium standard intermediate solution: pipette 10 mL of cadmium standard stock solution (3.7) into a 100 mL volumetric flask, dilute with 1 mol/L hydrochloric acid (3.5) to the scale and shake well. Each milliliter of this solution is equivalent to 10 μg of cadmium. 3.9 Cadmium standard working solution: pipette 10 mL of cadmium standard intermediate solution (3.8) into a 100 mL volumetric flask, dilute with 1 mol/L hydrochloric acid (3.5) to the scale and shake well. Each milliliter of this solution is equivalent to 1 μg of cadmium. 4  Instruments and Apparatuses  4.1 Analytical balance, accuracy of 0.000 1 g. 4.2 Muffle furnace. 4.3 Atomic absorption spectrophotometer. 4.4 Hard beaker, 100 mL. 4.5 Volumetric flask, 50 mL. 4.6 Colorimetric tube with stopper, 25 mL. 4.7 Measuring pipets, 1, 2, 5 and 10 mL 4.8 Transfer pipets, 5, 10, 15 and 20 mL. 5  Preparation of Samples  Collect at least 2 kg of representative feeds sample, divide into about-250 g by quartation, put through a 1 mm sieve, mix well and seal in an airtight wide-necked sample bottle to prevent deterioration. Store at low temperature for later use. 6  Determination Procedures  6.1 Sample treatment Accurately weigh 5~10 g of sample, put into a 100 mL hard beaker (4.4), place in the Muffle furnace (4.2), and leave the furnace door open slightly. Start from a low temperature, heat up to 200℃ and hold for 1 h, then heat up to 300℃ and hold for 1 h, finally heat up to 500℃ and burn for 16 h until the sample becomes white or gray and does not contain any carbon granules. ......