Sampling Contoh Uji Air Tanah #laboratorium #sampling #lingkungan #akreditasi

Summary

The video script details the process of water sampling from a well in the Tanah Bumbu Environmental Laboratory. It covers the step-by-step procedure, including measurements of well depth, groundwater level, and air temperature. Sampling techniques are explained, such as rinsing sample containers and using calibrated instruments like pH meters and infrared thermometers. The script also discusses filtering for dissolved metals and phosphate, as well as preserving samples with nitric acid and sterilization procedures for microbiological tests. The process ensures accurate, contamination-free results for water quality analysis.

Takeaways

• 😀 Water sampling was performed on a well in the Tanah Bumbu Environmental Laboratory.
• 😀 The internal diameter and depth of the well were measured, including the depth of the groundwater and the water level in the well.
• 😀 The water sample was collected at half the depth of the well's water level after calculating the depth of both the well and groundwater.
• 😀 Before sampling, the containers were washed three times with deionized water to ensure cleanliness.
• 😀 The water temperature was measured using a calibrated infrared thermometer to ensure accuracy.
• 😀 pH measurements were taken using a calibrated pH meter in situ until stable and consistent readings were obtained.
• 😀 After measuring pH, the water was filtered using 10.45 µm filter paper for dissolved metal analysis.
• 😀 Metal samples were preserved with nitric acid (1:1 ratio) to prevent changes in the sample during transport.
• 😀 Microbiological samples (such as for E. coli) were collected in sterilized bottles and fixed with a Bunsen burner to prevent contamination.
• 😀 The samples were placed in sterilized boxes with appropriate preservatives and stored in a cool environment for analysis.
• 😀 Special care was taken to avoid contamination during the entire sampling and preservation process, ensuring the integrity of the collected data.

Q & A

What is the first step in the water sampling process from a dug well?

The first step is to measure the internal diameter of the dug well, followed by measuring the well's depth, groundwater level, and water level in the well.

How should the depth of the well be measured accurately?

The depth of the well should be measured using a weighted rope to ensure accuracy.

At what depth should the water sample be collected?

The water sample should be collected at half the depth of the water in the well.

What is the purpose of rinsing the sampling container three times before use?

Rinsing the sampling container three times with the water to be tested prevents contamination and ensures that the sample is not influenced by any residues in the container.

What tool is used to measure the temperature of the well water?

The temperature of the well water is measured using a calibrated infrared thermometer.

How should the sampling cup or gauge be prepared before use?

The sampling cup or gauge should be rinsed with distilled water before use to prevent any contamination.

Why is pH measurement important in water sampling?

pH measurement is crucial as it provides important information about the acidity or alkalinity of the water, which can affect the solubility of substances and the health of ecosystems.

What type of filter paper is used for sample filtration in this process?

A 10.45 micrometer filter paper is used for filtering dissolved metals and phosphate from the sample.

How are samples preserved for testing dissolved metals?

Samples are preserved by adding nitric acid in a 1:1 ratio for testing dissolved metals, and then stored in a cooling box with ice.

What steps are taken to prevent contamination during microbiological sampling?

During microbiological sampling, bottles are sterilized with alcohol, fixed with a Bunsen burner, and then the sample is collected and sealed to avoid external contamination.