Click image to view full size image
Hexavalent chromium analyzer,in acidic solution, hexavalent chromium reacts with diphenylcarbazide to form a purple-red compound, which exhibits maximum absorption peak at specific wavelengths.
|
Range range |
(0-2)mg/L |
|
Precision |
≤5% |
|
Indication error |
±10% |
|
Zero drift |
±5% |
|
Range drift |
±5% |
|
Detection limit |
0.01mg/L |
|
Ambient temperature stability |
±10% |
|
Voltage stability |
±5% |
|
Memory effect |
±10% |
|
Comparative testing of actual water samples |
±10% |
|
Ambient temperature |
(5-40)℃ |
|
Relative humidity |
(65±20)% |
|
Power supply voltage |
(220±10%)V |
|
Power frequency |
(50±1%)Hz |
Hexavalent chromium analyzer is mainly used in the field of online water quality monitoring of fixed pollution sources such as industrial wastewater, domestic sewage and aquaculture wastewater discharge.
① European Union
In the EU, hexavalent chromium (Cr(VI)) is listed as a Substance of Very High Concern (SVHC), requiring companies to register and assess its risks. The REACH Regulation restricts the use of hexavalent chromium in industrial and consumer products, particularly in leather goods and textiles that come into direct contact with the skin, where the hexavalent chromium content must not exceed 3 mg/kg. Additionally, the EU's Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH) Regulation specifies restrictions and usage conditions for hexavalent chromium substances, including occupational exposure limits and environmental emission limits.
② United States
In the U.S., the Occupational Safety and Health Administration (OSHA) sets the workplace exposure limit for hexavalent chromium at 0.05 mg/m³ and requires companies to implement engineering controls. California's Proposition 65 lists hexavalent chromium as a carcinogen, mandating warning labels on products. Furthermore, the military standard MIL-DTL-5541F requires the use of chromium-free passivators for surface treatment of military aluminum materials.
③ Japan
In Japan, the JIS standard stipulates that salt spray testing for galvanized sheets must be validated using chromium-free passivators, with corrosion resistance requirements of ≥1000 hours.
④ India
In India, BIS certification mandates chromium-free passivator testing for imported metal products, with non-compliant products prohibited from sale.
⑤ China
In China, the "14th Five-Year Plan for Comprehensive Prevention and Control of Heavy Metal Pollution" restricts hexavalent chromium emissions and requires the elimination of chromium-containing passivators in the galvanizing and aluminum industries. The "Integrated Wastewater Discharge Standard" sets the hexavalent chromium wastewater discharge limit at ≤0.5 mg/L, with non-compliant chromium-based processes facing shutdown risks.
⑥ International Organizations
The United Nations' Stockholm Convention lists hexavalent chromium as a Persistent Organic Pollutant (POP), calling for global reduction in its use.
http://www.huihuan-tech.com/