Result from…

Component

Matrix

Nominal

concentration/ (ppm)

Dilution

factor

Standard

addition/ (ppm)

External calibration graph/(ppm)

Bias/(%)

%RSD(^a)/%

U(^b)/(%)

BNP

M1

250

25

232.5

232.1

−0.17

1.51

3.18

BNP

M2

250

25

297.2

299.4

0.74

1.39

3.52

BNP

M3

250

25

255.7

257.1

0.54

2.17

4.89

BIT

M1

75

25

69.4

70.1

0.99

1.95

4.88

BIT

M2

75

25

72.4

70.3

−2.90

1.89

6.67

BIT

M3

75

25

74.5

75.2

0.93

2.38

5.70

CMI

M1

15

6

11.8

11.4

−3.86

2.07

8.00

CMI

M2

15

6

11.1

10.7

−3.19

1.53

6.26

CMI

M3

15

6

10.8

10.4

−3.67

1.80

7.27

MI

M1

15

6

4.1

4.2

3.84

3.10

10.04

MI

M2

15

6

4.1

4.0

−1.41

1.22

3.85

MI

M3

15

6

3.9

3.9

0.19

2.08

4.35

MI

M1

75

25

75.9

76.8

1.26

1.88

5.01

MI

M2

75

25

80.9

80.1

−0.98

1.43

3.84

MI

M3

75

25

85.7

86.1

0.47

1.16

2.79