Sampling Air Permukaan (Air Sungai) #laboratorium #sampling #lingkungan #akreditasi

Summary

This video outlines a detailed water sampling procedure for environmental testing, conducted at Jalan Dharma Praja. The process includes measuring river flow parameters like width, depth, and velocity, followed by the collection of various water samples for chemical analysis. Key parameters like pH, turbidity, conductivity, and dissolved metals are measured on-site using calibrated instruments. The samples are then preserved with appropriate chemicals, labeled, and stored in ice boxes for transport to the lab. The entire procedure emphasizes accuracy, contamination prevention, and proper sample handling for reliable test results.

Takeaways

• 😀 The fieldwork involved water sampling at Jalan Dharma Praja for environmental analysis, focusing on oil, pH, turbidity, electrical conductivity, and metals.
• 😀 The team measured the river's width and depth, with a recorded depth of 0.35 meters for accurate sampling.
• 😀 Flow velocity of the river was measured using a current meter, with speeds recorded at 0.6 meters per second and 0.3 meters per second.
• 😀 Water samples for oil and fat analysis were collected using dark glass bottles, with a total volume of approximately 500 ml.
• 😀 All sampling bottles were polypropylene and rinsed three times with sample water before use to avoid contamination.
• 😀 pH measurements were taken with a calibrated Horiba D51 pH meter, with readings ranging from 6.6 to 6.67.
• 😀 Turbidity was recorded using a turbidity meter, with readings between 9.41 and 9.42 NTU.
• 😀 Electrical conductivity was measured using a calibrated conductivity meter, with a recorded value of 0.0273 mS/cm.
• 😀 For dissolved metals, samples were filtered and preserved with nitric acid (HNO3) for metals and sulfuric acid (H2SO4) for other parameters.
• 😀 All samples were stored in iceboxes with ice packs to maintain the correct temperature during transport back for analysis.

Q & A

What is the first step in the river water sampling process?

The first step involves preparing the necessary equipment and transportation. The team travels to the sampling location at Jalan Dharma Praja, ensuring all tools for measurements and sample collection are ready.

How is the river's flow rate measured during the sampling process?

The river's flow rate is measured by first calculating the width of the river using a tape measure. Then, the depth of the river is determined, followed by measuring the flow speed with a current meter, which records a flow speed of 0.6 meters per second.

What is the method for sampling oil and fats in the water?

Oil and fat in the surface water are sampled using a 500 ml dark glass bottle. The sample is then preserved by adding sulfuric acid (H2SO4) in a 1:1 ratio to prevent degradation.

What kind of bottles are used for metal testing, and why?

For metal testing, polypropylene bottles are used, as they are resistant to contamination and interaction with the sample. These bottles are rinsed three times with the sample water before use to ensure no external contamination.

How is the pH of the river water measured, and what was the pH value recorded?

The pH is measured using a calibrated Horiba D51 pH meter. The recorded pH values ranged from 6.6 to 6.7.

What tools are used to measure the turbidity of the river water?

Turbidity is measured using a turbidity meter. The recorded turbidity value was 9.42 NTU (Nephelometric Turbidity Units).

How is the electrical conductivity of the water determined?

The electrical conductivity of the water is measured using a calibrated conductivity meter, which recorded a value of 0.0273 mS/cm (milliSiemens per centimeter).

What chemicals are used for sample preservation, and for which parameters?

For preserving metal samples, nitric acid (HNO3) in a 1:1 ratio is used. For other parameters such as turbidity, sulfuric acid (H2SO4) is used to prevent sample degradation.

What precautions are taken to prevent contamination of the samples during collection?

Samples are carefully handled to avoid contamination. Bottles are pre-rinsed with sample water, and alcohol is used to disinfect bottles and equipment. Additionally, the samples are stored in iceboxes to maintain a low temperature during transport.

How are the collected water samples stored and transported?

After collection, the water samples are stored in an icebox containing ice packs. This ensures the samples remain at a stable temperature during transportation to the laboratory for analysis.