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VOL. 11, ISSUE 2 (2026)
The analysis of total suspended solids in the downstream Mahakam River, Kutai Kartanegara District, East Kalimantan, Indonesia
Authors
Ramadhani Ayu Saputri, Iwan Suyatna, Widya Kusumaningrum
Abstract
Downstream of a river of Mahakam represent an
estuarine area. This area shows the flow rate of the water has decreased, the
bed has expanded, the depth has decreased. The color of the water has changed
due to turbidity, suspended solids and plankton. The temperature of the water
increased and the amount of dissolved oxygen decreased. It is characterized by
dense anthropogenic activities, ranging from residential settlements to
transportation traffic, which potentially trigger an increase in sediment
loading. This study aims to analyze the concentration of Total Suspended Solids
(TSS) and its distribution on the basis of the tides. The study was performed
in month of September 2025, a purposive sampling method was used to decide the
locations to collect the data from 15 sampling sites. TSS concentration was analyzed
using gravimetric method, spatial mapping by using the Inverse Distance
Weighted (IDW) interpolation technique, and data were processed by using
Spearman Rank correlation analysis. The concentration of TSS of each sampling
site above may could be affected and related to land use such as settlements
(sampling site 6), industrial zones (sampling site 13, 14). Statistical tests
confirmed a very strong and significant negative correlation between TSS
concentration and dissolved oxygen (DO) (r = -0.988$; p < 0.01). Meanwhile,
the correlation with current velocity was found to be non-significant (p >
0.05), affirming that sediment dynamics are predominantly controlled by human
intervention, local morphology, and tidal fluctuations rather than natural
river current factors. The results showed that the concentration of TSS ranging
from 14.88 to 39.98 mg/L indicating still within the permissible limit
according to Government Regulation PPRI No. 22 year 2021. Spatially, the
highest concentration of TSS 39.98 mg/L was found at sampling site 10 then
followed by sampling site 7, and at sampling site 11 and 12.
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Pages:82-86
How to cite this article:
Ramadhani Ayu Saputri, Iwan Suyatna, Widya Kusumaningrum "The analysis of total suspended solids in the downstream Mahakam River, Kutai Kartanegara District, East Kalimantan, Indonesia". International Journal of Zoology Studies, Vol 11, Issue 2, 2026, Pages 82-86
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