Table 1: The concentration levels of elements (μg/g) in four-standard reference materials obtained in this work (Exp.) together with the certified values (Cert.).

Hair (GBW07601)Urban particulate (SRM 1648)Apple leaves (SRM 1515)Orchid leaves (SRM 1571)
Exp.Cert.Exp.Cert.Exp.Cert.Exp.Cert.

Na139 ± 5.9152 ± 104028 ± 214250 ± 2029 ± 124 ± 181 ± 0.782 ± 6
K%
Al277 ± 2286 ± 9
S%
Cl26 ± 435*564 ± 6579 ± 23
V<0.20.03*
Mn6 ± 0.2 52 ± 0.254 ± 3
Mg2583 ± 152710 ± 80
Ca%
Cu10 ± 0.8 545 ± 19609 ± 277 ± 0.6 12 ± 0.712 ± 1
Zn187 ± 12190 ± 54305 ± 534760 ± 14022 ± 0.625 ± 2
Br 0.4*494 ± 3500 ± 25 1.89 ± 0.110 ± 1
Sr21 ± 324 ± 1207 ± 1530 ± 437 ± 3
I 0.8*
Ba17 ± 0.417 ± 1667 ± 92737 ± 4044 ± 149 ± 242 ± 444 ± 4
Dy<0.030.017
U 0.09*
As 115 ± 1115 ± 1011 ± 0.110 ± 1
Cd<4 79 ± 975 ± 7
Sb 46 ± 245 ± 23 ± 0.13 ± 0.3
La 36 ± 0.544 ± 21 ± 0.02
Sm 0.012*4 ± 0.034 ± 0.3
Au 0.0025*
Sc8 ± 0.1**8 ± 1**6 ± 0.27 ± 0.1
Cr<0.260 357 ± 9403 ± 12
Fe52 ± 654 ± 6* % %252 ± 11300 ± 28
Co 16 ± 0.418 ± 2
Se 25 ± 927 ± 1
Ag<0.07 6 ± 0.36 ± 0.2
Ce 56 ± 155 ± 41 ± 0.11 ± 0.1

* Not certified.
**ng/g.