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SN/T 4589-2016: Rapid determination of nitrate in vegetables for export - Improved cadmium reduction method
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| SN/T 4589-2016 | English | 329 |
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Rapid determination of nitrate in vegetables for export - Improved cadmium reduction method
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SN/T 4589-2016
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Basic data | Standard ID | SN/T 4589-2016 (SN/T4589-2016) | | Description (Translated English) | Rapid determination of nitrate in vegetables for export - Improved cadmium reduction method | | Sector / Industry | Commodity Inspection Standard (Recommended) | | Classification of Chinese Standard | X26 | | Word Count Estimation | 14,174 | | Date of Issue | 2016-08-23 | | Date of Implementation | 2017-03-01 | | Regulation (derived from) | State-Quality-Inspection-Certification (2016)438 | | Issuing agency(ies) | General Administration of Customs | SN/T 4589-2016: Rapid determination of nitrate in vegetables for export - Improved cadmium reduction method
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Rapid determination of nitrate in vegetables for export-Improved cadmium reduction method
People's Republic of China Exit Inspection and Quarantine standards
Rapid determination of nitrate in exported vegetables
Improved cadmium reduction assay
2016-08-23 released
2017-03-01 Implementation
People's Republic of China
General Administration of Quality Supervision, Inspection and Quarantine released
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
Please note that some of this document may be patentable. The release of this document
The agency does not assume responsibility for identifying these patents.
This standard is proposed and managed by the National Certification and Accreditation Administration Committee.
This standard was drafted by the People's Republic of China Heilongjiang Exit Inspection and Quarantine, China Inspection and Quarantine Science Institute.
The main drafters of this standard. Liu Ye, Wang Haibo, Ma Wei, Division Xuebing, Wang Fei, Liu Feng, Hao Shijie, Wu Yongsheng, Wang Chuan Song, Zou Mingqiang.
Rapid determination of nitrate in exported vegetables
Improved cadmium reduction assay
1 Scope
This standard specifies the rapid determination of nitrate in exported vegetables improved cadmium reduction analysis.
This standard applies to the detection of nitrate in export vegetables.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version applies to this article
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 6682 analytical laboratory water specifications and test methods
3 method summary
After the sample was removed macromolecules such as pigments, the sample was nitrate cadmium reduction column to nitrite, nitrite after diazo coupling
Color, according to the color depth and nitrite standard quantitative comparison, the total amount of nitrite measured, thus subtracting the total amount of nitrite in the sample background
Content, that is, the nitrate content of the sample.
4 Reagents and materials
Unless otherwise indicated, the reagents used were of analytical grade, water is in line with GB/T 6682 of water.
4.1 Borax (Na2B4O7 · 10H2O, powder).
4.2 Potassium ferrocyanide [K4 (Fe (CN) 6) · 3H2O].
4.3 Zinc acetate [Zn (CH3COO) 2 · 2H2O].
Hydrochloric acid (37%, p = 1.19 g/mL).
4.5 Ammonia (25%, ρ = 0.91 g/mL).
4.6 p-aminobenzenesulfonic acid (C6H7NO3S).
4.7 Naphthalene ethylenediamine hydrochloride (C12H14N2 · 2HCl).
4.8 Sodium nitrate (NaNO3, purity not less than 99%).
4.9 Sodium nitrite (NaNO2, purity not less than 99%).
4.10 zinc tablets.
4.11 Zinc rod.
4.12 cadmium sulfate (3CdSO4 · 8H2O).
4.13 saturated borax solution Weigh 50.0g borax (4.1), placed in 1000mL reagent bottle, dissolved in water and diluted to 1000mL.
4.14 potassium ferrocyanide solution (0.25mol/L). Weigh 106.0g potassium ferrocyanide (4.2), placed in 1000mL reagent bottle, add water-soluble
Solution and dilute to 1000mL.
4.15 zinc acetate solution (1mol/L). Weigh 220.0g zinc acetate (4.3), placed in 1000mL reagent bottle, dissolved in water and diluted to
1000mL.
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