GB/T 39229-2020 in English
VALIDFertilizers and soil conditioners—Determination of arsenic,cadmium,chromium,lead and mercury contents
- Issued on:2020-11-19
- Implemented on:2021-06-01
- File Format:PDF
- Delivery:Via email within 5 business days
$418.00
《GB/T 39229-2020肥料和土壤调理剂 砷、镉、铬、铅、汞含量的测定》由TC105（全国肥料和土壤调理剂标准化技术委员会）归口，主管部门为中国石油和化学工业联合会。
Introduction
Standard Overview
GB/T 39229-2020 is equivalent to ISO 17318:2015 international standard, which specifies the method of using microwave digestion-inductively coupled plasma optical emission spectrometer (ICP-OES) to determine five heavy metal elements in fertilizers and soil conditioners. The standard is applicable to all types of fertilizer products, and it is particularly noted that the applicability of the method needs to be verified for micronutrient fertilizers.
Core Detection Technology
| Element | Detection Wavelength(nm) | Internal Standard Element | Detection Limit(mg/kg) |
|---|---|---|---|
| Arsenic(As) | 189.042 | - | 0.02 |
| Cadmium(Cd) | 228.802 | - | 0.02 |
| Chromium(Cr) | 283.563 | Indium (In) | 0.02 |
Typical Application Cases
A compound fertilizer company found that the chromium content exceeded the standard when using this standard for testing. After tracing the source, it was found that the chromium content in the raw material phosphate rock was too high. By changing the raw material supplier, the heavy metal content of the product met the standard. Test data: Cr=112mg/kg (standard limit 50mg/kg).
Method Precision Requirements
Based on the validation data of 14 laboratories, the precision statistical model is as follows:
| Element | Repeatability Limit (r) | Reproducibility Limit (R) |
|---|---|---|
| Mercury (Hg) | 0.252x0.5824 | 0.374x0.7715 |
| Lead (Pb) | 0.100x0.8499 | 0.499x0.6432 |
Implementation suggestions
- Organic fertilizer samples need to be weighed less to 0.5g to avoid incomplete digestion
- For mercury detection, it is recommended to add a cold steam generator to improve sensitivity
- Each batch of samples must be accompanied by a quality control sample, and the recovery rate should be controlled at 85-115%
Note:This standard will be officially implemented on June 1, 2021, replacing the original industry method.
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