DISTRIBUTION OF NUTRIENT CONCENTRATION IN THE DOWNSTREAM OF THE MAHAKAM RIVER, EAST KALIMANTAN PROVINCE

Abstract

The Mahakam River is largest river in East Kalimantan Province which flows into the Mahakam Delta. This river crosses the West Kutai Regency area in the upstream, to Kutai Kartanegara Regency and Samarinda City in the downstream. The purpose of this study was to determine and analyze the nutrient content in the Mahakam River. The study was conducted in November 2023 in the downstream Mahakam River in East Kalimantan province by collecting data on nutrients, temperature, brightness, current, pH, DO, rainfall. Sampling using the Purposive Sampling method at 18 sampling points. The results showed that based on 6 segments, the NO₃-N value ranged from 0.064 mg/L - 0.448 mg/L, the NO₂-N value ranged from 0.021 mg/L - 0.105 mg/L, the NH₃-N value ranged from 0.078 mg/L - 0.369 mg/L and PO₄-P ranged from 0.078 mg/L - 0.0.369 mg/L. The supporting parameter values of the 6 segments for temperature ranged from 28.0°C - 28.7°C, DO ranged from 3.1 mg/L - 3.7 mg/L, Clarity ranged from 0.19 m - 0.22 m, pH ranged from 6.58 - 6.73, and current ranged from 0.32 m/s - 0.61 m/s. The results of the study showed that the value of the Kruskal-Wallis test was not significant.