His colleague, Martin Klaproth, found that a substance had contaminated the sulfuric acid solution ... the presence of selenium causes other impurities in glass to lose their color.

Due to the "high volume - low concentration" character, no sustainable solution has been found yet to treat selenium-contaminated drainage waters originating from the San Joachin Valley ...

Due to the "high volume - low concentration" character, no sustainable solution has been found yet to treat selenium-contaminated drainage waters originating from the San Joachin Valley ...