GB/T 4482-2018 in English
VALIDWater treatment chemicals—Ferric chloride
- Issued on:2018-02-06
- Implemented on:2018-09-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
Introduction
Core changes in the standard revision
| Technical indicators | 2006 edition | 2018 edition | Description of changes |
|---|---|---|---|
| Heavy metal detection method | Spectrophotometry/Arsenic spot method | Atomic fluorescence spectrometry | Detection accuracy increased by 10 times |
| Zinc content indicator | Not specified | ≤0.0005% | New key control items |
| Chromium determination method | Spectrophotometry | Electrical Heating Atomic Absorption | Detection limit reduced to 0.0008% |
Product Classification Technical Requirements
The standard divides ferric chloride into two categories according to its use: Class I is used for drinking water treatment, requiring that the raw materials must be industrial synthetic hydrochloric acid and high-purity iron; Class II is suitable for industrial wastewater and sludge treatment. The density of the liquid product must be ≥1.4g/cm³, and the content of ferric chloride hexahydrate crystals in the solid product must be ≥20%.
Optimization of key detection methods
- Iron content determination: Iodine titration method is used, and the allowable difference of parallel determination is ≤0.05%
- Heavy metal detection:
- Arsenic/mercury detection uniformly adopts atomic fluorescence spectrometry
- Lead and cadmium determination uses flame atomic absorption spectrometry
- Chromium detection uses electric heating atomic absorption spectrometry
Implementation and application suggestions
In the actual application of water plants, it is recommended that:
1. Class I products need to focus on monitoring zinc and arsenic indicators, and it is recommended to conduct atomic fluorescence spectrometry re-inspection every month
2. During sludge dehydration treatment, the free acid of Class II products should be controlled to ≤0.8% to extend the life of the equipment
3. The storage temperature of liquid products should be maintained at 5-30℃ to avoid crystallization
Analysis of Standard Evolution
Since its first release in 1984, this standard has been revised four times. The 2018 version mainly strengthens:
- Drinking water safety indicators (six new heavy metal limits)
- Modernization of detection methods (full use of instrumental analysis)
- Packaging classification management (food-grade PE barrel requirements)
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