WEB 25 is an aqueous solution of a heavy metal precipitant effective in precipitating low concentrations of precious and heavy metal ions from industrial aqueous effluent. WEB 25 is recommended as a polishing chemical for effluent containing 10-500 ppm total metal ion, but should also be considered as an alternative to inadequate conventional techniques for precipitation of much higher levels of metal ions. WEB 25 is extremely effective in precipitating copper, even from solutions containing complexed or chelated copper. It is also effective on other metals including cadmium, chromium (III), gold, iron, magnesium, mercury, nickel, silver , and zinc.

WEB 25 is not recommended for aluminum, arsenic, chromium (VI) and molybdenum. The sludge cake produced from its use as heavy metal precipitant is compact, highly insoluble, and easily dewatered. Its low solubility means that is less susceptible to leaching and it is more likely to pass leaching tests such as those required by the U.S. EPA.

APPLICATION

Recommended dosage for WEB 25
( ppm WEB 25/ ppm Metal )

Metal	Dosage
Ag (I)	4
Au (I)	2
Au (III)	6
Cd (II)	7
Cu (I)	6
Cu (II)	12
Fe (II)	14
Fe (III)	21
Hg (I)	2
Hg (II)	4
Mg (II)	33
Ni (II)	13
Zn (II)	12