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Guangzhou Institute of Microbiology Group Co., Ltd
Testing of protective materials for water transmission and distribution
NegotiableUpdate on 03/14
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Overview
The testing of protective materials for water transmission and distribution is a key link in ensuring the safety of drinking water. Its core is to ensure that the materials do not release harmful substances into the water and avoid secondary pollution of water quality.
Product Details
The testing of protective materials for water transmission and distribution is a key link in ensuring the safety of drinking water. Its core is to ensure that the materials do not release harmful substances into the water and avoid secondary pollution of water quality. The following is a detailed introduction to the testing of protective materials for water transmission and distribution:
1、 Detection object and scope
The protective materials for water transmission and distribution mainly include anti-corrosion coatings, lining, sealing materials, etc. used for the inner walls of water tanks, water towers, and pipelines. Specifically, it includes:
Anti corrosion coatings: such as epoxy resin coatings, polyester coatings (including alkyd resins, acrylic resins, polyurethane coatings, etc.).
Lining materials: such as cement mortar lining, polyethylene lining, rubber gasket, waterstop, etc.
Sealing materials: such as sealing strips, sealing rings, etc.
2、 Testing standards and basis
The testing is mainly based on the following national standards and specifications:
GB/T 17219-1998 "Safety Evaluation Standards for Drinking Water Transmission and Distribution Equipment and Protective Materials"
It specifies the hygiene and safety requirements, inspection methods, and evaluation criteria for protective materials.
Suitable for all protective materials that come into direct contact with drinking water, including coatings, liners, sealing materials, etc.
GB 5749-2022 "Sanitary Standards for Drinking Water"
The final effluent quality must meet this standard, and the testing items include sensory characteristics, general chemical indicators, toxicological indicators, and microbiological indicators.
Other relevant standards
Specific testing methods are provided in GB/T 5750-2023 "Standard Test Methods for Drinking Water".
The metal material shall comply with GB 4806.9-2016 "National Food Safety Standard - Metal Materials and Articles for Food Contact".
The plastic material shall comply with GB 4806.7-2016 "Plastic Materials and Articles for Food Contact".
3、 Core testing items
The testing items cover the safety, chemical stability, and microbiological safety of materials, mainly including:
Sensory trait indicators
Chromaticity, turbidity, odor, and visible substances: reflect the sensory quality of water and indirectly indicate the possibility of pollution.
General chemical indicators
PH value, oxygen consumption (CODMn), total dissolved solids, volatile phenols: High oxygen consumption indicates excessive organic matter leaching.
Toxicological indicators
Heavy metals: lead, cadmium, chromium, mercury, arsenic, antimony, barium, selenium, nickel, etc., prevent chronic poisoning, carcinogenesis, and teratogenicity.
Organic compounds: formaldehyde, benzene derivatives, vinyl chloride monomer, epichlorohydrin, etc., prevent carcinogenesis and mutagenicity.
Microbiological Index
Total colony count, total coliform count, mold and yeast count: prevent processing equipment from becoming a breeding ground for microorganisms.
4、 Testing methods and processes
soak test
Simulate long-term contact conditions: Cut the material into samples according to standard ratios (such as 1cm ²/mL) and place them in soaking solution.
Soaking conditions:
Room temperature soaking: 20 ± 5 ℃, 24 to 72 hours.
Accelerated soaking: 60 ± 2 ℃, 24 hours (used to predict long-term dissolution risk).
Soaking solution: pure water (pH=8 ± 1), acidic/alkaline solution (simulating harsh conditions).
chemical analysis
Heavy metal detection: Atomic absorption spectroscopy (AAS) and inductively coupled plasma mass spectrometry (ICP-MS) are used.
Organic compound detection: gas chromatography (GC), liquid chromatography (HPLC).
Microbial testing
Total bacterial count detection: Plate counting method to evaluate the degree of microbial contamination.
Coliform group detection: using multi tube fermentation method or membrane filtration method to determine whether it meets microbial safety standards.
5、 Significance and Importance of Detection
Prevent secondary pollution
Ensure that protective materials do not release toxic and harmful substances such as heavy metals, organic monomers, stabilizers, etc. into drinking water.
Ensuring public health
Prevent heavy metals, organic compounds, microorganisms, etc. from entering the human body through protective materials, which can cause health risks such as chronic poisoning, carcinogenesis, and teratogenicity.
Market access prerequisites
Water protection materials produced or sold in China must pass health and safety inspections and obtain a water related product hygiene permit ("water related permit"), otherwise they cannot be sold or used.
6、 Testing institutions and qualifications
The testing must be conducted by a third-party organization with CMA (China Metrology Certification) and water related product testing qualifications to ensure the accuracy and reliability of the testing results. The testing report must comply with national mandatory health regulations and requirements, providing scientific basis for product market access.