OR/15/070 Appendix 3

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Reason, D A, Watts, M J, and Devez, A. 2015. Quantification of phytic acid in grains. (Inorganic Geochemistry, Centre for Environmental Geochemistry). British Geological Survey Internal Report, OR/15/070.

Blank data for detection limit and limit of quantification

Table 5    Blank raw data
[phytic acid] mg kg-1
Blank 1 1034
Blank 2 772
Blank 3 912
Blank 4 981
Blank 5 1160
Blank 6 832
Blank 7 772
Blank 8 912
Blank 9 981
Blank 10 1160

Oat flour reference material raw data

Table 6    Oat flour reference material raw data
Oat Powder (g/100g) Oat Powder (mg kg-1)
1.8466 18466
1.843 18430
1.7794 17794
1.6441 16441
1.8179 18179

Standards at 7 and 80% of the top calibration standard raw data

Table 7    Standards at 7 and 80% of the top calibration standard raw data

5% standard

Phosphorus Phytic acid
Target Value (mg kg-1) 517 1790
Mean measurement (mg kg-1) 474 1679
Accuracy 92% 94%
Measured SD (mg kg-1) 34 122
Precision (%RSD) 7.2 7.2

80% standard

Phosphorus Phytic acid
Target Value (mg kg-1) 6000 23679
Mean measurement (mg kg-1) 5970 21233
Accuracy 99% 90%
Measured SD (mg kg-1) 298 902
Precision (%RSD) 5.0 4.2

All rice and grain sample raw data

Table 8    All rice and grain sample raw data
Run 1 Run 2 Run 3 Run 4 Run 5

Phytate (mg kg-1)

Rice 1 6383 6619 6587 NA 6311
Rice 1 6430 6371 5849 NA 6215
Rice 1 6616 6343 6932 NA 6650
Rice 2 1463 1856 1121 1301 1796
Rice 2 1826 1963 1285 1274 1632
Rice 2 1585 1743 1364 1033 1775
Grain 1 9688 12274 11998 9628 11069
Grain 1 9784 12772 11533 10831 10709
Grain 1 9953 12373 9159 11097 11587
Grain 2 9272 10337 8748 10921 9433
Grain 2 9629 10235 9209 11569 9878
Grain 2 8984 9799 9161 8675 11285
Table 9    Spike recovery raw data
Phytic acid
Target Value (mg kg-1) 9090
Mean Measurement (mg kg-1) 8550
Average Recovery (%) 94
Measured SD 65
Precision (%RSD) 0.8

Analyst variation raw data

Table 10    Analyst variation raw data
ADZ lentils [Phytic acid mg kg-1] DR Lentils [Phytic acid mg kg-1]
6762 6129
7791 7791
6310 6310
8173 6762
7486
8968
6335
7633
8496