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JUDUL | : | ANALISIS KADAR NITRAT, FOSFAT, DAN KELIMPAHAN FITOPLANKTON SEBAGAI INDIKATOR TINGKAT PENCEMARAN DAN KESUBURAN PERAIRAN DI SUB DAS MARTAPURA (STUDI KASUS IRIGASI KARANG INTAN, KALIMANTAN SELATAN) | |
PENGARANG | : | ROSA | |
PENERBIT | : | UNIVERSITAS LAMBUNG MANGKURAT | |
TANGGAL | : | 2023-07-05 |
ABSTRAK
Sub DAS Martapura, Irigasi Karang Intan terindikasi adanya pencemaran perairan
yang disebabkan oleh peternakan sapi pada stasiun 2. Indikasi tersebut akan berpotensi
menyebabkan tercemarnya perairan terhadap kualitas air sehingga tingkat kesuburan
menjadi rendah. untuk menghindari hal tersebut perlu adanya pengukuran kadar nitrat,
fosfat, dan kelimpahan fitoplankton sehingga mendapatkan hasil yang akurat mengenai
tercemar atau tidaknya perairan tersebut. Lokasi penelitian dilakukan secara survei
lapangan, dengan titik pengambilan sampel ditetapkan secara purposive sampling.
Parameter yang diukur meliputi suhu, pH, DO, kecerahan, nitrat, fosfat, dan kelimpahan
fitoplankton. Standar baku mutu mengacu pada peraturan pemerintah No. 22 Tahun
2021 kelas II, dengan metode pengukuran menggunakan metode indeks pencemaran,
indeks kualitas air, kelimpahan fitoplankton, indeks saprobitas, dan uji regresi linear
sederhana. Parameter yang tidak memenuhi baku mutu yakni oksigen terlarut dan fosfat.
Perhitungan tingkat pencemaran menggunakan indeks pencemaran didapatkan range
nilai 1,0-5,0 dan indeks kualitas air didapatkan hasil 50. Perhitungan tingkat kesuburan
menggunakan kelimpahan fitoplankton didapatkan range nilai 100-40.000 sel/l dan
indeks saprobitas didapatkan range nilai -2-1,5. Hasil korelasi hubungan fitoplakton
dengan variabel kualitas air dari korelasi sangat lemah hingga kuat. Kesimpulan pada
tingkat pencemaran menggunakan indeks pencemaran menunjukkan kategori tercemar
ringan dan indeks kualitas air menunjukkan kategori sedang. Tingkat kesuburan
menggunakan kelimpahan fitoplankton tergolong kesuburan sedang dan indeks
saprobitas pada sampling pertama kategori kesuburan rendah dan sampling kedua
kategori kesuburan sedang. Korelasi hubungan kelimpahan fitoplankton dengan oksigen
terlarut korelasi sangat lemah dan hubungan kelimpahan fitoplankton dan pH korelasi kuat
Kata Kunci: Kualitas Air, Sub DAS Martapura, Pencemaran, Kesuburan, Kelimpahan
Fitoplankton, Indeks Pencemaran, Indeks Kualitas Air, Indeks Saprobitas,
Uji Regresi Linear Sederhana
ABSTRACT
Martapura Sub Watershed, Karang Intan Irrigation indicated the existence of water
pollution caused by cattle farming at station 2. These indications will potentially cause
pollution of waters to water quality so that the level of fertility becomes low. To avoid
this, it is necessary to measure the levels of nitrate, phosphate, and phytoplankton
abundance so as to get accurate results regarding whether the waters are polluted or not.
The research location was carried out by field survey, with the sampling point
determined by purposive sampling. The parameters measured include temperature, pH,
DO, brightness, nitrate, phosphate, and phytoplankton abundance. Quality standards
refer to government regulation No. 22 of 2021 class II, with measurement methods using
the pollution index method, water quality index, phytoplankton abundance, saprobity
index, and simple linear regression test. Parameters that do not meet the quality standards
are dissolved oxygen and phosphate. Calculation of the level of pollution using the
pollution index obtained a value range of 1.0-5.0 and the water quality index obtained a
result of 50. Calculation of the level of fertility using phytoplankton abundance obtained
a value range of 100-40. 000 cells/l and saprobity index obtained a range of values of -
2-1.5. The results of the correlation of phytoplankton relationships with water quality
variables from very weak to strong correlations. The conclusion on the level of pollution
using the pollution index shows a mildly polluted category and the water quality index
shows a moderate category. The level of fertility using phytoplankton abundance is
classified as moderate fertility and the saprobity index in the first sampling of the low
fertility category and the second sampling of the moderate fertility category. The
correlation of the relationship between phytoplankton abundance and dissolved oxygen
is very weak correlation and the relationship between phytoplankton abundance and pH
is strong correlation.
Keywords: Water Quality, Martapura Subwatershed, Pollution, Fertility, Phytoplankton
Abundance, Pollution Index, Water Quality Index, Saprobity Index, Simple Linear Regression Test
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