Calibration standard (ng/ml)

10

50

100

200

500

Metal

Pb

10

50.914

100.113

202.038

498.658

Zn

10

48.914

93.605

196.051

498.790

Cu

10

50.893

98.404

203.210

499.146

Cd

10

50.120

99.280

201.541

499.515