As the supplementary information for
other's answers.
It is because the Cr6+ is more toxic
than Cr or Cr3+, but its existence in nature is by chemical compound in
solid state with other ions or ionic groups. The analysis is to measure
how much of chromium existed as the state of Cr6+ in the chemical compounds
of the product. Though existed in chemical compound state (solid),
when inhaled or other ways into human bodies, it will be then decomposed
into Cr6+ in human body (as the salt dissolved in blood or water) to cause
toxic reaction. How we verify the existence of Cr6+ is usually by
X-Ray Fluorescence (nondestructive), UV-Visible Spectroscopy (destructive)
quantitatively, or other known chemical reactions quantitatively or qualitatively.
Hope this helps, and please feel free to let me know if any further information
necessary, thank you very much!!
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Benjamin Chen
Regional Technical Coordinator, Asia-Pacific
Consulting and Training
Underwriters Laboratories Taiwan Co., Ltd.
Tel: 886-2-2896-7790 ext. 62267, Fax: 886-2-2896-6140 [log in to unmask]
- Know by test, and state the facts. -
Web site: http://www.UL.com.tw
Dear All：
为什么RoHS管制+6价的Cr?在我认为：固态的产品（电镀层）如何出现离子态，很另人困惑~,恳请各位支招!
谢谢!
Best Regards
************************************************
支架事业处 工程&品管 课长 李子祎
扬州华夏集成光电有限公司
地址：江苏扬州经济开发区扬子江南路518号(邮编：225009)
网址：http://www.darewinchip.com
邮箱：[log in to unmask]
电话：0514-87849588ext:8086
传真：0514-87849312
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