Mapping Projections Of Water Hardness Of The Groundwater In Palu Using The Web-Based Google MapsAPI

Abstract

The groundwater research has conducted for mapping the distribution of water hardness using the web-based Google Maps API application and for determining the level of the average hardness of the ground water in the City of Palu, which has higher water hardness. All sampling points which were labelled green, yellow and red, where green and yellow colour which indicated that the hardness value was still low, but red indicatedan high hardness values. The obtained hardness results in 4 districts in Palu by using the titration method of complexometry or EDTA titration were different, namely the District of South Palu, West Palu, East Palu, and District of North Paluwere12,54 mg/l – 15,68 mg/l, 11,87 mg/l – 98,58 mg/l, 10,53 mg/l – 15,68 mg/l, and t 10,3 mg/l – 89,59 mg/l, respectively. However, these resultswere still under the maximum threshold. It was influenced by the content of water-soluble salts of hardness ions such as Ca 2+ , Mg 2+ , and Fe 2+ , and it was also affected by CO 2 free and a large amount ofNaCl, which can increase the water hardness. Keyword: Water hardness, groundwater, Google Maps API, Complexometry T itration