<p><span style="color: #333333; font-family: arial, sans-serif; font-size: 14px; line-height: 18px;">Chinese emergency personnel are erecting barrages and pouring hundreds of tonnes of chloride into a river in southern China</span><span style="color: #333333; font-family: arial, sans-serif; font-size: 14px; line-height: 18px;">&nbsp;in a desperate effort to prevent a toxic spill from contaminating the supplies of a major city.</span></p>