人们不得不与六价铬共存并从源头上管理它。

We have to live with hexavalent chromium and manage it at the source.

首先，他们将三管铬黄曝露在紫外线辐射中，直到其中一管变成巧克力色。

First, they exposed three tubes of chrome yellow to UV radiation until one turned a chocolate color.

然而“绿色和平”组织认为废水中的有毒水平远比政府承认的要高的多，砷含量比许可量要多25倍。 而且其中还有大量的汞和铬。

Yet Greenpeace says that toxin levels in the sludge are much higher than the government admits, with arsenic at 25 times the permitted amount, and significant levels of mercury and chrome.

d123 And we can do that just going along, 3 d 1, 2 3, and the problem comes when we get to chromium here, which is instead of what we would expect, 4s23d4 we might expect to see 4 s 2, 3 d 4.

我们能做的就是继续，问题出现了,当我们来到铬元素时，它不是我们预期的那样，我们可能预期。