HEAVY METALS TREATED SOIL EFFECTS ON THE CONCENTRATION OF CHLOROPHYLL A, B, AND MINERAL ELEMENTS IN ALGAE

Soil treated with different concentrations of copper (75, 160, and 190 mg/kg soil) and cadmium (4, 8, and 10 mg/kg soil) had assessments for their effects on the growth of algae (Cladophora and Spirogyra). Soil treated with copper (190 mg/kg) and cadmium (10 mg/kg) has shown a significant impact, decreasing the dry weight of Cladophora (1.600 and 0.353 mg) and Spirogyra (1.500 and 0.189 mg). Chlorophyll a and b content also expressed decreased with copper application to the soil at 190 mg/kg. Cladophora and Spirogyra algae had concentrations of 0.082 and 0.007 mg/g fresh weight, respectively. In algae Cladophora, the cadmium (10 mg/kg soil) levels reached 0.073 and 0.008 mg/g of fresh weight, while Spirogyra had concentrations of 0.013 and 0.011 mg/g. In the nutrient concentration status of cladophora, soil treatment with cadmium (10 mg/kg) was the most beneficial for phosphorus, chloride, and sodium levels (0.170, 0.010, and 0.010 mg/g, respectively). Similarly, the phosphorus and sodium concentrations had declined with copper treatments in algae spirogyra (0.150 and 0.040 mg/g, respectively), while chloride concentration reduction was by cadmium (10 mg/kg soil).