Kesadahan adalah suatu kondisi dimana air mengandung mineral CaCO3, Ca2+ dan Mg2+ yang tinggi. Tujuan penelitian ini adalah untuk menganalisis kadar kesadahan total, kalsium dan magnesium dalam air sumur tanah di daerah Cilincing, Sunter dan Pluit serta analisis penurunan nilai kesadahan total dengan menggunakan mineral adsorben yakni zeolit. Metode yang digunakan yaitu titrasi kompleksometri. Pengujian dilaksanakan di Laboratorium Kimia Farmasi ISTN Jakarta. Hasil penelitian menunjukkan bahwa air sumur tanah pada daerah Cilincing, Sunter dan Pluit memiliki kadar kesadahan total, kalsium, dan magnesium yang melebihi batas persyaratan. Prosentase nilai penurunan kadar kesadahan total, kalsium dan magnesium pada daerah cilincing mencapai 56.80%, 52.72%, 47.06%. Prosentase nilai penurunan kadar kesadahan total, kalsium, dan magnesium pada daerah sunter mencapai 57.19%, 50.99%, 34.05%, dan prosentase nilai penurunan kadar kesadahan total, kalsium, magnesium pada daerah pluit mencapai 58.18%, 53.69%, 35.94%. Penggunaan zeolit sebagai adsorben untuk menurunkan kadar kesadahan total air sumur tanah terbukti efektif untuk menurunkan kadar kesadahan total, kalsium dan magnesium.
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