div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: Chromium in Water Supplies src=https:reader031vdocumentsnetreader031viewer2022020522575068181a28ab0f07ae9241html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divp© 1960 Nature Publishing Grouppdiv