AOAC RI ERP EBOOK FOR FERTILIZERS

Author Response to Reviewers 071506_OMAMAN-28-AOAC 2006.03_rev 071816

NIST SRM 695

Magruder 2009-06

Concensus, ICP

Recovery, %

Element

Certified

Mean

Recovery, % Bias

Mean

Bias

As, mg/kg Cd, mg/kg Co, mg/kg Cr, mg/kg Mo, mg/kg Ni, mg/kg Pb, mg/kg Se, mg/kg

200 ± 5

199.9

100.0

0.1

108.43

27.87

330.58 ± 20.55 358.45

16.9 ± 0.2

17.1

111.2

0.2

101.33

4.59

343.55 ± 19.70 348.14

65.3 ± 2.4

61.7

103.9

3.6

101.41

13.36

945.97 ± 53.68 959.33

244 ± 6

226.4

92.8

17.6 111.68 ± 11.16 127.93

114.55

16.25

20.0 ± 0.3

19.5

107.3

0.5

17.80 ± 2.70

18.10

101.66

0.30

135 ± 2

127.6

94.5

7.4

98.37

18.47

1135.8 ± 81.32 1117.33

3688.5 ± 1852.4

276 ± 17

284.9

103.2

8.9

4869.59

132.02

1181.1

2.1 ± 0.1*

1.6

74.6

0.5

116.46 ± 8.33

110.56

94.93

5.90

Ca, %

2.26 ± 0.04

2.3

102.5

0.0

1.78 ± 0.12

1.79

100.43

0.01

Cu, ppm

1225 ± 9

1214.4

99.1

10.6

334 ± 38

339.69

101.70

5.69

Fe, %

3.99 ± 0.08

4.0

99.7

0.0

2.03 ± 1.02

3.03

149.03

1.00

Mg, % 1.79 ± 0.05

1.8

98.2

0.0

0.18 ± .12

0.19

105.89

0.01

0.305 ± 0.005 0.325 ± 0.005

Mn, %

0.3

101.9

0.0

0.153 ± 0.013

0.18

115.54

0.02

Zn, %

0.3

97.7

0.0

0.165 ± 0.11

0.16

99.25

0.00

*Reference Value Table 6. Comparison of results of certified and consensus values with bias included.