The specific wavelengths used were as follows: chromium,357.87 nm; cadmium, 228.80 nm; Arsenic, 193.7 nm; and lead,283.31 nm; the detection limits for the metals were as follows: lead,
0.05 mg/L; chromium, 0.02 mg/L; cadmium, 0.002 mg/L; arsenic 0.2 mg/L [23]