Investigation of Drinking Water Quality in Kosovo

Table 1

Values of certified and calculated NIST 1643e SRM reference water analyzed by ICPMS and internal standard used for correction.

	NIST 1643e SRM, 𝑛=7
Element (Unit)	Certified ± STD	Measured ± STD	Trueness mean ± STD	Internal standard
Li (μg/L)	17.4 ± 1.7	17.9 ± 1.0	102.7 ± 5.4	Sc
Be (μg/L)	13.64 ± 0.17	13.50 ± 0.39	99.0 ± 2.9	Sc
B (μg/L)	154 ± 3.9	161.4 ± 7.7	104.8 ± 4.8	Sc
Na (mg/L)	20.23 ± 0.26	20.58 ± 0.42	101.7 ± 2.0	Sc
Mg (μg/L)	7841 ± 98	8077 ± 247	103.0 ± 3.1	Sc
Al (μg/L)	138 ± 8.6	146.0 ± 2.4	105.8 ± 1.7	Sc
K (μg/L)	2034 ± 29	1975 ± 53	97.1 ± 2.7	Sc
Ca (mg/L)	32.3 ± 1.1	30.0 ± 0.89	92.7 ± 3.0	Sc
V (μg/L)	37.86 ± 0.59	37.33 ± 0.60	98.6 ± 1.6	Sc
Cr (μg/L)	20.4 ± 0.24	20.78 ± 0.43	101.8 ± 2.1	Sc
Mn (μg/L)	38.97 ± 0.45	37.73 ± 0.82	96.8 ± 2.2	Sc
Fe (μg/L)	98.1 ± 1.4	100.2 ± 1.1	102.2 ± 1.1	Sc
Co (μg/L)	27.06 ± 0.32	26.66 ± 0.41	98.5 ± 1.5	Sc
Ni (μg/L)	62.41 ± 0.69	61.90 ± 0.78	99.2 ± 1.3	Ge
Cu (μg/L)	22.76 ± 0.31	23.08 ± 1.21	101.4 ± 5.3	Ge
Zn (μg/L)	78.5 ± 2.2	77.37 ± 3.61	98.6 ± 4.7	Ge
As (μg/L)	60.45 ± 0.72	60.90 ± 2.26	100.7 ± 3.7	Ge
Rb (μg/L)	14.14 ± 0.18	13.54 ± 0.47	95.7 ± 3.5	Ge
Sr (μg/L)	323.1 ± 3.6	340.5 ± 20.1	105.4 ± 5.9	Ge
Mo (μg/L)	121.4 ± 1.3	120.8 ± 2.9	99.5 ± 2.4	Ge
Ag (μg/L)	1.062 ± 0.075	1.037 ± 0.067	97.6 ± 6.4	In
Cd (μg/L)	6.568 ± 0.073	6.541 ± 0.191	99.6 ± 2.9	In
Sb (μg/L)	58.3 ± 0.61	50.45 ± 1.69	86.5 ± 3.4	In
Te (μg/L)	1.09 ± 0.11	1.00 ± 0.06	92.1 ± 6.5	In
Ba (μg/L)	544.2 ± 5.8	526.4 ± 18.0	96.7 ± 3.4	In
Tl (μg/L)	7.445 ± 0.096	7.139 ± 0.246	95.9 ± 3.4	Lu
Pb (μg/L)	19.63 ± 0.21	18.94 ± 0.52	96.5 ± 2.8	Lu
Bi (μg/L)	14.09 ± 0.15	13.99 ± 0.49	99.3 ± 3.5	Lu