GB/T 43419.2-2023
Heavy metal treatment in rice fields Part 2: Passivation conditioning (English Version)
- Standard No.
- GB/T 43419.2-2023
- Language
- Chinese, Available in English version
- Release Date
- 2023
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Latest
- GB/T 43419.2-2023
- Scope
- This document stipulates the selection of passivation conditioning agents, implementation methods, influencing factors, and secondary environmental risk prevention for the passivation conditioning of paddy fields with single or combined pollution of cadmium, mercury, arsenic, lead, and chromium. This document is applicable to the treatment of paddy field soils with single or combined pollution of cadmium, mercury, arsenic, lead, and chromium. This document is not applicable to the treatment of paddy field soils contaminated by dry farming and radioactive heavy metals.
- Introduction
Technical Specifications for Heavy Metal Treatment in Paddy Fields
GB/T 43419.2-2023 standard specifies the passivation conditioning technology for heavy metals such as cadmium, mercury, arsenic, lead, and chromium in paddy fields. It aims to reduce the effectiveness or total amount of heavy metals in the soil through the scientific selection and implementation of passivation conditioning agents, thereby ensuring the safe production of agricultural products and sustainable use of soil.
Classification and application scope of passivation conditioners
Heavy metal type Recommended passivation conditioner Applicable conditions Application range (kg/hm²) Cadmium pollution Calcium-based, silicon-based, carbon-based, iron-based Choose according to soil pH value (<5.5 or ≥6.5) Inorganic: 1000~4500; Organic: 3000~7500 Mercury pollution Calcium-based, silicon-based, sulfur-based, carbon-based When the soil pH value is ≥5.5, carbon-based materials are preferred. Inorganic: 1000~4500; Organic: 3000~7500 Arsenic pollution Iron-based, carbon-based, microbial Depending on soil pH value and organic matter content Inorganic: 1000~4500; Organic: 3000~7500 Lead pollution Calcium-based, carbon-based, peat When the soil pH value is ≥5.5, carbon-based materials are preferred. Inorganic: 1000~4500; Organic: 3000~7500 Chromium pollution Carbon-based, iron-based, peat-based Based on soil pH and heavy metal distribution Inorganic: 1000~4500; Organic: 3000~7500 Implementation suggestions and precautions
1. Application period:It is recommended to spread during the tillage period to ensure that it is fully mixed with the tillage layer of soil. Double-season rice areas need to choose the right time according to the planting cycle.
2. Application amount adjustment:Flexibly adjust according to soil pH, organic matter content and texture factors. When using ammonium nitrogen fertilizer, the application amount of passivator should be increased, while nitrate nitrogen fertilizer can be reduced appropriately.
3. Water management:Different heavy metal pollution requires different water strategies. For example, cadmium and chromium polluted fields should be kept flooded from the filling stage to the maturity stage, while arsenic and mercury polluted fields should be properly drained to reduce the risk of methylation.
4. Microbial assistance:It is recommended to use bacteria with heavy metal conversion ability (such as laccase bacteria) to effectively improve the passivation effect and reduce the accumulation of harmful elements in rice.
GB/T 43419.2-2023 Referenced Document
- GB 15618 Soil environment quality risk control standard for soilcontamination of agriculture land
- GB/T 43419.1 Heavy metal control in rice fields Part 1: General principles
GB/T 43419.2-2023 history
- 2023 GB/T 43419.2-2023 Heavy metal treatment in rice fields Part 2: Passivation conditioning