Article Supplymental Materials: Perchlorate Levels in Polish Water Samples of Various Origin

Przemysław Niziński 1,*, Patrycja Wiśniewska 1, Joanna Kończyk 2 and Rajmund Michalski 3

1 Department of Analytical Chemistry, Medical University of , 4a Chodźki Str., 20-093 Lublin, ; [email protected] 2 Institute of Chemistry, Health and Food Sciences, Faculty of Mathematics and Natural Sciences, Jan Dlugosz University in Czestochowa, 36a Armii Krajowej Str., 42-200 Czestochowa, Poland; [email protected] 3 Institute of Environmental Engineering, Polish Academy of Sciences, 34 Maria Curie- Skłodowska Str., 41-819 Zabrze, Poland; [email protected] * Correspondence: [email protected]

Figure 1S. DI water (blank sample) chromatogram.

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Figure 2S. Perchlorate standard solution (5 µg/L) chromatogram.

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Figure 3S. Real sample (river water No 8) chromatogram. Other matrix ions are present (not quantified).

Figure 4S. Comparison of perchlorate health advisory levels in drinking water with results of determination in water samples. The types of samples are represented by numbers (See Table 1 in main document)

Table 1S. Results of perchlorate determination in water samples (extended). Perchlorate Sample Sample Sample origin Source Region concentration type1 number [µg/L] ± SD2 1 Mineral water NA Małopolskie

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14 Mineral water NA Lubelskie

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18 Dęblin Municipal Lubelskie

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Upper 10 Odra River Śląskie

1 Numbers in brackets are the sample codes, see Fig. 1

2 Standard deviation

* estimate, below LOQ and above LOQ

Table 2S. Analytical conditions.

Apparatus Metrohm 930 Compact IC Flex Column Metrosep A Supp 5 150 x 4.0 mm Pre-column Metrosep A Supp 4/5 Guard 50 x 4.0 mm Eluent flow rate 0.5 ml/min 7 mM sodium bicarbonate + 2 mM sodium carbonate + 25% Eluent composition acetonitrile Column temperature 25 oC Sample volume 250 µl Expected backpressure 13,7 MPa

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