FORM IDENTIFICATION OF MICROPLASTICS IN THE MARTAPURA RIVER: A CASE STUDY WEST SIDE OF MUARA KELAYAN

Abstract

Microplastics are plastics with a size > 5 mm – 1 µm. The existence of microplastics is influenced by
human activities. Muara Kelayan is an area that is flowed by the Martapura River which has the largest
population in Banjarmasin. This study aims to identify forms of microplastics in water and sediments.
The sampling method uses purposive sampling and repetition referring to SNI 8995 – 2021. The
microplastic extraction method in water uses 10% KOH and NaCl, the sediment extraction method uses
oven drying at 70°C and NaCl. The form of microplastic is observed using a binocular microscope with
a magnification of 40x and Sedgewick Rafter Cell (SRC) as preparat. The mikroplastik identified in water
was in the form of 93.05% fiber, 4.71% fragments and 2.24% film. The form of mikroplastik in the
sediment samples was 63.95% fiber, 30.63% fragment, 5.06% film, and 0.36% pallet.