PENENTUAN KADAR BESI (Fe) DALAM SAMPEL AIR DARI SUMUR KAMPUS DIPLOMA TEKNIK UNIVERSITAS DIPONEGORO DENGAN SPEKTROFOTOMETER GENESYS 20 VISIBEL (Determination Of Level Iron (Fe) In Water Samples From Well Campus Diploma Engineering Diponegoro University Using Genesys 20 visibel Spectrophotometer ) - SARI, RINI RATNA (2015)