Kartläggning av berggrunden i Jönköpings kommun med risk för höga halter bly och kadmium i enskilda dricksvattenbrunnar

Sammanfattning: Lead (Pb) and cadmium (Cd) are two heavy metals that exist naturally in low concentrations throughout earth’s crust. In some places lead and cadmium are found in higher concentrations due to the bedrock in the area. A study made in Höörs County by the Geological Survey of Sweden (SGU) has shown high rates of lead and cadmium in drilled wells just west of the city Höör. They found that the reason for the high rates of lead and cadmium were due to natural circumstances in the area, specifically due to sedimentary rock such as sandstone and slate with galena and sphalerite incorporated. This study is made in Jönköpings County and based on the study made in Höörs county. 11 drilled wells were tested for high rates of lead and cadmium in four different areas with sedimentary rock, such as sandstone and slate, to try and find out if the bedrock in the areas affects the groundwater negatively. The results showed no high rates of either lead or cadmium except for one well where the rate was 13 µg/L which is higher than the limit (10 µg/L) put on drinking water by National Food Agency in Sweden, due to leads poisonous character. The high rate of lead in one well out of 11 is probably due to human activities such as combustion or the iron and steel industry. It could also be due to errors in the construction of the well or the material used. This results in the conclusion that high rates of lead and cadmium does not correlate with the bedrock in the four areas where tests were made in Jönköpings County.