Experimental Study on the Cause of Inorganic Scale Formation in the Water Injection Pipeline of Tarim Oilfield

Table 1

Water inorganic ion analysis method.

Element	Method	Reference method	LOD
Chloride	Mohr/colorimetric method	ASTM D4458	0.5 mg/L
Basicity	Potentiometry	ASTM D 1067	1 mg/L
Ammonia	Titrimetry	GB/T 7478	nitrogen 0.2 mg/L
Barium	Atomic absorption method	GB/T 15506; ASTM D 3651	1.7 mg/L
Calcium	Atomic absorption method EDTA titration	GB/T 11905	0.02 mg/L
		GB/T 7476	1 mg/L
Ferrum	Atomic absorption method o-phenanthroline spectrophotometric method	GB/T 11911; ASTM D 1068
Magnesium	Atomic absorption method	GB/T 11905	0.0005 mg/L
Potassium	Atomic absorption method	GB/T 11904	0.05 mg/L
Sodium	Atomic absorption method	GB/T 11904	0.02 mg/L
Strontium	Atomic absorption method	SY/T 5982	0.03 mg/L
Sulfide	Iodometry	HJ/T 60	0.4 mg/L