Element to Calcium ratios in
  JCp-1 (porites coral standard) and JCt-1 (Tridacna Giant Clam standard)
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JCp-1   Porites - coral standard :

El mg/kg ± unit MW mmol/kg El/Ca unit mg/kg % as
Ca 382362 2001 mg/kg 40.08 9540 1 mol/mol 954856 95.49 CaCO3
Ba 10.3 0.5 mg/kg 137.33 0.075 7.86 µmol/mol 15 0.00 BaCO3
Fe 29 2 mg/kg 55.85 0.52 54.43 µmol/mol 60 0.01 FeCO3
K 185 8 mg/kg 39.1 4.73 0.50 mmol/mol 327 0.03 K2CO3
Mg 972 8 mg/kg 24.31 40.0 4.19 mmol/mol 3371 0.34 MgCO3
Mn 1 0.1 mg/kg 54.94 0.018 1.91 µmol/mol 2 0.00 MnCO3
Na 4350 30 mg/kg 22.99 189.2 19.83 mmol/mol 10027 1.00 Na2CO3
P 4.1 0.9 mg/kg 30.97 0.13 13.88 µmol/mol 4 0.00 P
Sr 7240 70 mg/kg 87.62 82.6 8.66 mmol/mol 12199 1.22 SrCO3
Al 485 info mg/kg 26.98 18.0 1.88 mmol/mol 916 0.09 Al2O3 !
B 47.7 info mg/kg 10.81 4.4 0.463 mmol/mol 48 0.00 B
Cd 0.03 info mg/kg 112.41 0.0003 28.0 nmol/mol 0.05 0.00 CdCO3
Cl 584 info mg/kg 35.45 16.5 1.73 mmol/mol 584 0.06 Cl
Li 1.3 info mg/kg 6.94 0.19 19.64 µmol/mol 1 0.00 Li
Mo 0.075 info mg/kg 95.94 0.0008 81.94 nmol/mol 0 0.00 Mo
S tot 1920 info mg/kg 32.07 59.9 6.28 mmol/mol 1920 0.19 S tot
Zn 0.5 info mg/kg 65.39 0.008 0.80 µmol/mol 1 0.00 Zn
                  98.43 SUM

JCp-1  Porites - coral standard :   https://gbank.gsj.jp/geostandards/Certificate/PDF/eJCp1.pdf

The element concentrations from Al to Zn are approximate and for information only - not certified values !!

The right hand side of the table is a recalculation of the elemental composition to mostly carbonates. This is hypothetical and simply for control, to show how much of the sample is captured by the analyses. This does not represent an actual XRD analyses !!!

The El/Ca ratios are for information only. recalculated from concentrations. Please use the ratios from the Hathorne et al (2013) paper. The ratios in this paper are agreed upon by the coral community after the JCp standard had been extensively analyzed in a lab comparison study with slightly different results:

Hathorne, EC, Gagnon, A, Felis, T, Adkins, J, Asami, R, Boer, W, Caillon, N, Case, D, Cobb, KM, Douville, E, deMenocal, P, Eisenhauer, A, Garbe-Schönberg, D, Geibert, W, Goldstein, S, Hughen, K, Inoue, M, Kawahata, H, Kölling, M, Cornec, FL, Linsley, BK, McGregor, HV, Montagna, P, Nurhati, IS, Quinn, TM, Raddatz, J, Rebaubier, H, Robinson, L, Sadekov, A, Sherrell, R, Sinclair, D, Tudhope, AW, Wei, G, Wong, H, Wu, HC and You, CF (2013) Interlaboratory study for coral Sr/Ca and other element/Ca ratio measurements. Geochemistry, Geophysics, Geosystems, 14(9). 3730-3750. doi:10.1002/ggge.20230


JCt-1 Tridacna Giant Clam Standard:


El mg/kg ± unit MW mmol/kg El/Ca unit mg/kg % as
Ca 390653 1144 mg/kg 40.08 9747  1  mol/mol 975560 97.56 CaCO3
Ba 6.1 0.4 mg/kg 137.33 0.044 4.66 µmol/mol 9 0.00 BaCO3
Fe 16 2 mg/kg 55.85 0.29 30.03 µmol/mol 33 0.00 FeCO3
K 89 8 mg/kg 39.1 2.28 0.24 mmol/mol 157 0.02 K2CO3
Mg 295 4 mg/kg 24.31 12.1 1.27 mmol/mol 1023 0.10 MgCO3
Mn 0.38 0.03 mg/kg 54.94 0.007 0.73 µmol/mol 1 0.00 MnCO3
Na 4440 20 mg/kg 22.99 193.1 20.24 mmol/mol 10235 1.02 Na2CO3
P 1.35 0.9 mg/kg 30.97 0.04 4.57 µmol/mol 1 0.00 P
Sr 1410 50 mg/kg 87.62 16.1 1.69 mmol/mol 2376 0.24 SrCO3
Al 275 info mg/kg 26.98 10.2 1.07 mmol/mol 520 0.05 Al2O3 !
B 19.4 info mg/kg 10.81 1.8 0.188 mmol/mol 19 0.00 B
Cd 0.0022 info mg/kg 112.41 0.0000 2.05 nmol/mol 0.00 0.00 CdCO3
Cl 95 info mg/kg 35.45 2.7 0.28 mmol/mol 95 0.01 Cl
Li 0.5 info mg/kg 6.94 0.07 7.55 µmol/mol 1 0.00 Li
Mo 0.015 info mg/kg 95.94 0.0002 16.39 nmol/mol 0 0.00 Mo
S tot 192 info mg/kg 32.07 6.0 0.63 mmol/mol 192 0.02 S tot
Zn 0.5 info mg/kg 65.39 0.008 0.80 µmol/mol 1 0.00 Zn
                  99.02 SUM

JCt-1   Tridacna - giant clam standard :  https://gbank.gsj.jp/geostandards/Certificate/PDF/eJCt1.pdf

The right hand side of the table is a recalculation of the elemental composition to mostly carbonates. This is hypothetical and simply for control, to show how much of the sample is captured by the analyses. This does not represent an actual XRD analyses !!!

The element concentrations from Al to Zn are approximate and for information only - not certified values !!
The El/Ca ratios are calculated from the concnetrations. These are not certified values!!

page created by M.Kölling & T.Feseker