Table S1. Precision and Recovery for the Reference Material, Digested with HNO3

Table S1.Precision and recovery for the reference material, digested with HNO3.

Detection limit
(µg g-1 dw) / Blanks (n=32) / Certified reference material (n=16) / Internal reference material (n=14)
Measured concentration
(µg g-1 dw) / Measured conc/ Mean conc in samples (%) / Certified concentration (µg g-1 dw) / Recovery (%) / Relativ standard deviation (%) / Analysed concentration (µg g-1 dw) / Recovery compared to previous analyses (%) / Relative standard deviation (%)
Al / 0.07 / 3.6 / 0.02 / 22 600 / 27 / 6.0 / 40 800 / 108 / 7.4
Ca / 0.02 / 1.2 / 0.003 / 29 000 / 95 / 3.6 / 6 018 / 4.7
Cd / 0.09 / u.d. / --- / 10.2 / 75 / 3.1 / 7.97 / 84 / 3.0
Co / 0.1 / u.d. / --- / 10.1 / 102 / 4.4 / 55.8 / 79 / 2.9
Cr / 0.05 / 0.5 / 4 / 29 600 / 94 / 4.0 / 42.9 / 82 / 3.3
Cu / 0.04 / 0.12 / 0.6 / 109 / 85 / 3.8 / 38.4 / 89 / 3.4
Fe / 0.08 / 2.8 / 0.008 / 113 000 / 82 / 5.0 / 50 760 / 97 / 5.1
Mg / 0.006 / 0.25 / 0.01 / 7 400 / 94 / 2.9 / 10 486 / 4.7
Mn / 0.015 / 0.05 / 0.006 / 785 / 72 / 4.1 / 1 870 / 94 / 4.3
Ni / 0.25 / u.d. / --- / 75.8 / 77 / 3.5 / 49.7 / 82 / 5.1
P / 1.6 / 14 / 1.1 / 3.8 / 1 550 / 4.5
Pb / 0.2 / u.d. / --- / 714 / 73 / 4.1 / 81.8 / 78 / 3.8
Ti / 0.015 / 0.15 / 0.04 / 6.8 / 1 650 / 112 / 6.4
V / 0.15 / u.d. / --- / 66.7 / 92 / 5.5
Zn / 0.15 / 1.3 / 0.8 / 1 720 / 88 / 4.2 / 193 / 80 / 4.9

u.d. = under detection limit