Micelle Mediated Trace Level Sulfide Quantification through Cloud Point Extraction

Table 2

Interference study.

Interfering ion	Tolerance limit (μg)
Cl^−	>1000
SO32−	10
SO32−^a	100
NO2−	20
NO2−^b	100
NO3−	1000
SO42−, CO32−	>200
I^−, PO43−	400
Zn^2+, Ca^2+,	>200
Cu^2+, Ni^2+	25
Pb^2+	200
Cd^2+	50
Mg^2+	600
Co^2+	05
HCHO	>1000

a. Sample was treated with 1 mL of formaldehyde (1000 μg/mL).
b. Sample was treated with 5 mL of 0.5% sulfamic acid.