Because the chemical reaction emitted NaOH so that the concentration of pH of water will increase in line with the report of the Department of agriculture & RURAL DEVELOPMENT-hue.Cyanua ion (CN-) is a water soluble substance is extremely toxic. It makes the animal's respiratory system takes oxygen consumption function. The IDLH concentration of CN is 25 g/1 million L.However, non-toxic by KLN but with large cyanua can also cause sea fish die-off.The central region is known to have many gold mines. Thus the possibility of the waste from the mining of gold and rare precious metal also is not lowA few examples are noted on the pain tainted KLN
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