Search results
Apr 10, 2018 · Laguna de Bay scored a low C- in water quality, with heavy phosphate and coliform loading, and a failing F for the state of its fisheries, with major problems in terms of invasive species, overfishing and declining natural food sources.
People also ask
Are there harmful pollutants in Laguna Lake?
Why is nutrient pollution a problem in Laguna de Bay?
Why is Laguna Lake deteriorating?
Is Laguna de Bay at risk?
Nov 8, 2017 · Serious pollution in a lake next to the mega-city of Manila is forcing a rethink by development planners to protect water quality and fish stocks. Laguna de Bay is the Philippines’ largest lake, and supplies Metro Manila’s 16 million people with a third of their fish.
- Water Sampling
- Sampling Processing
- Microplastic Identification
- Quality Control
Microplastics were collected on February 25, 2022 using a plankton net from the surface water of Laguna de Bay, following the methods by Viršek et al. (2016) with some modifications. A plankton net with a mesh size of 20 μm was used at each sampling site. The boat traveled 10 m while the net was set at a depth of 20 cm to keep the entire net submer...
In the laboratory, all glassware were washed thoroughly with distilled water for decontamination. Solids collected in the plankton nets were soaked in KOH solution and heated in a 60 °C oven for 24 hours to digest organic material found during the water sampling. The sample is then floated to extract the plastic debris using density separation in N...
Microscopy
All suspected microplastic particles were mounted on glass slides using a clean needle. A microscope with a magnification of 40x was used to determine the morphological characteristics of the sampled microplastics from various sampling sites through visual inspection. Additionally, a film was characterized as a tiny, very thin coating or a substantial chunk of plastic trash, while a fiber was described as a microplastic with a long, slender appearance. Pellets were described as spherical, rou...
Abundance
The density of microplastics was calculated by the total number of microplastic items divided by the total water volume. This method was modified based on the study of Egessa et al. (2020). Total reflectance–Fourier transform infrared (ATR-FTIR) spectroscopy analysis was attenuated. FTIR (Fourier-transform infrared spectroscopy) produces an infrared absorption spectrum to identify chemical bonds in a molecule. The spectra generate a sample profile, a unique molecular fingerprint that can be u...
Quality control of this study was done following the methods by Egessa et al. (2020) with some modifications. During microscopy, all the dried samples to be analyzed were kept covered in glass Petri dishes. Background contamination from laboratory sources via the air and laboratory tools and equipment were tested using procedure blanks made from gl...
Feb 23, 2022 · Laguna Lake does not only suffer from a deteriorated water quality. Studies have also pointed out that a combination of issues including pollution, siltation, perennial turbidity—among others ...
Nov 8, 2017 · Laguna de Bay is the Philippines’ largest lake and a vital source of fish, water and recreation for millions of people. Learn how UN Environment and its partners are working to reduce nutrient pollution, over-fishing, sedimentation and illegal reclamation in the lake.
May 22, 2024 · Despite its Class C status, Laguna de Bay is feared to go the way of Pasig River — a vital waterway connecting Laguna de Bay to Manila Bay — that was declared biologically dead due to unregulated pollution by humans and industry.
Jul 9, 2021 · In a study of scientists from the University of the Philippines, there are harmful pollutants found in different parts of Laguna Lake that are threats to water safety and to human health. The pollutants in the lake are largely caused by human activities.
