... .5-5.027.040-90----1.53.5-5.0Ammonia nitrogen (N) % ≤Arsenic (As) % ≤Lead (Pb) % ≤Cadmium (Cd) % ≤Mercury (Hg) % ≤Chrome ... .00010.000010.00050.010.00020.0010.00020.000010.0005 ----Note : ammonia gas, arsenic, lead, cadmium, mercury, chrome and other impurities quality ...