Code

ψ(x)

(mg/kg)

The absolute error between ψ(x) and the measured data (mg/kg)

θ(x)

(μg/L)

The absolute error between θ(x) and the measured data (μg/L)

Y1

5.596

0.009

28.470

5.360

Y2

5.539

2.885

35.583

8.349

Y3

5.618

2.874

41.490

0.306

Y4

5.811

2.572

45.122

0.504

Y5

6.017

3.854

44.770

3.443

Y6

5.917

2.072

38.335

0.178

Y7

5.277

0.907

31.362

0.472

Y8

5.600

2.157

36.357

2.644

Y9

6.960

1.389

31.278

0.932

Y10

3.033

1.082

20.714

0.094

Y11

6.317

0.185

47.010

0.454

Y12

4.177

0.067

23.968

0.291

Y13

7.510

0.015

49.409

0.092