4.2.3.2	Zn2+	0.1 mM, 91% inhibition	14	
4.2.3.2	phosphate	competitive inhibitor at pH values between 6.0 and 8.0	16	
4.2.3.2	Cu2+	0.1 mM, 94% inhibition	19	
4.2.3.2	Co2+	0.1 mM, 25% inhibition	23	
4.2.3.2	p-chloromercuribenzoate	0.1 mM, 98.4% inhibition	43	
4.2.3.2	Cd2+	0.1 mM, 100% inhibition	52	
4.2.3.2	Ag+	0.1 mM, 92% inhibition	75	
4.2.3.2	hydroxylamine	-	85	
4.2.3.2	Pb2+	0.1 mM, 75% inhibition	139	
4.2.3.2	CN-	1 mM, 88% inhibition	159