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6770356 
Journal Article 
DETERMINATION OF HEAVY METAL CONTENTS IN ST. JOHN'S WORT (HYPERICUM SPP) IN ZONGULDAK, TURKEY 
Colak, S; Yazici, K; Akca, SB 
2020 
1 
Fresenius Environmental Bulletin
ISSN: 1018-4619
EISSN: 1610-2304 
29 
5 
3571-3578 
WOS:000535839400028 
This study was carried out to determine the accumulation of heavy metals in St. John's wort (Hypericumspp.) samples grown naturally in Zonguldak province / Turkey. In the study, plant and soil samples were collected from three locations where St. John's wort plants widely grew. ICP OES was employed for determining useful heavy metal concentrations in the soil for the plant. The concentrations of Chromium (Cr), Nickel (Ni), Copper (Cu), Zinc (Zn), Cadmium (Cd), Lead (Pb), metal, and trace elements in St. John's Wort plant (flower and stem) and soil samples were analyzed using Perkin ElmerNexION 300D ICP - MS device. Pearson's Correlation analysis was used for determining the relationship between metal concentrations, and the ANOVA test was employed for determining the difference between metal concentrations arising according to the locations and samples. In addition, cluster analysis was used for identifying the similarities of metal concentrations by locations. In conclusion, according to the location evaluation, the lowest concentration of Cd and the highest concentration of Zn were found in Devrek location. In addition, the analyses indicated that heavy metals such as Cr, Cu, and Zn were found above 1 ppm in all locations. The highest heavy metal concentrations in the flower part were found in Devrek with 9.53 ppm Zn and in caycuma with 3.44 ppm Cu. 
Heavy metal; Environment; Soil pollution