Praktikum Geokimia: Teknik Penanganan Sampel Air
Summary
TLDRThis script outlines the essential steps for geochemical water sampling, including selecting a sampling location, collecting, filtering, and preserving the sample. It details the necessary equipment and materials, such as pH paper, beakers, and various bottles, along with safety gear and a hannameter for measurements. The process involves rinsing equipment, observing physical and chemical properties, and recording data like pH, EC, and TDS. Special preservation methods are highlighted for different analyses, emphasizing the importance of safety and accurate data collection for geochemical studies.
Takeaways
- 📍 Geochemical water sampling involves three main steps: choosing the location, collecting the sample, and filtering and preserving it.
- 🧰 Preparation of equipment and materials is essential before field observation and sample collection.
- 🔬 Necessary equipment includes universal pH paper, beaker glass, glass bottles, isotope bottles, HDPE bottles, filters, syringes, and a water dipper.
- 🧴 Materials needed for the process are Aquadest, Zn acetate 2 M, and nitric or hydrochloric acid.
- 🌡 The hannameter instrument is used for measuring pH, temperature, electrical conductivity (EC), and total dissolved solids (TDS).
- 📊 The physical properties of water, such as color, odor, and EC, are observed directly, while pH and TDS are measured using the hannameter.
- 💧 Water sampling should be conducted carefully to avoid contamination, preferably in flowing water to prevent sediment collection.
- 🌡️ Temperature is an important physical property to note during the sampling process, as it can affect water quality.
- 🚰 All equipment must be rinsed with the water sample at least three times to ensure no contaminants alter the analysis.
- 🔒 Proper preservation methods are crucial for different types of analysis, such as adding strong acid for cation analysis or Zn acetate for sulfide analysis.
- 🏥 The samples must be transported to the laboratory quickly in a cooler box to maintain their integrity for analysis.
Q & A
What are the general steps involved in collecting a water sample for geochemical analysis?
-The general steps involved in collecting a water sample for geochemical analysis are choosing the sampling location, collecting the water sample, and filtering and preserving the water sample.
What is the first preparatory action required before conducting field observation and sample collection?
-The first preparatory action is to prepare the necessary equipment and materials for water sampling.
List the equipment needed to collect a water sample as mentioned in the script.
-The equipment needed includes universal pH paper, beaker glass, glass bottle with a rubber seal, isotope bottle, HDPE bottle, filter, syringe, and water dipper.
What materials are required along with the equipment for water sampling?
-The materials required are Aquadest, Zn acetate 2 M, nitric acid or hydrochloric acid.
What are the supporting equipment and materials mentioned for safety and measurement purposes?
-Supporting equipment and materials include latex gloves, a mask, and a hannameter instrument.
Can you describe the specific sampling location mentioned in the script?
-The sampling location is at coordinate 49M 430567 E 914162 S with an elevation of 117 meters above sea level, located in Code River, Sendowo, Sinduadi Village, Mlati District, Sleman Regency, Daerah Istimewa Yogyakarta, 500 meters to the southwest of the Geological Engineering Department, Gadjah Mada University.
When was the water sampling conducted, and what was the weather condition on that day?
-The water sampling was conducted on Thursday, 22 October 2020, with the weather being partly cloudy and a temperature of 28 degrees Celsius.
How should the water dipper be prepared before collecting the water sample?
-The water dipper should be rinsed using the water sample for three times to ensure no contaminants are present that could alter the analysis results.
What are the physical and chemical properties that need to be observed and measured during water sampling?
-The physical properties include temperature, color, odor, and electrical conductivity (EC). The chemical properties include pH and total dissolved solids (TDS).
How is the pH, electrical conductivity, and TDS measured using the hannameter instrument?
-The hannameter instrument is arranged, ensuring the sensor cap does not dry out. The sensor is inserted into the water sample, and the readings for pH, EC, and TDS are recorded.
What preservation methods are used for different types of water sample analysis?
-For anion analysis, no preservation is needed. For cation analysis, a strong acid is added until the pH is less than 2. For sulfide analysis, 1 drop of Zn acetate 2 M is added for every 25 ml of sample.
How should the filtered water sample be stored before being brought to the laboratory?
-The filtered water sample should be put into isotope bottles and HDPE bottles, and then placed into a cooler box to maintain its condition before being transported to the laboratory.
What is the purpose of preserving a backup sample in a glass bottle with a rubber seal?
-The backup sample in a glass bottle sealed with a rubber seal is kept for future reference or in case the primary samples are compromised or additional tests are needed.
Outlines
🔬 Geochemical Water Sampling Process
This paragraph outlines the essential steps for collecting water samples for geochemical analysis, which include choosing the sampling location, collecting the sample, and filtering and preserving it. It emphasizes the importance of preparing necessary equipment and materials such as pH paper, beaker glass, glass and isotope bottles, filters, and syringes, as well as chemicals like Aquadest, Zn acetate, and acids for preservation. The script also details the sampling location with specific coordinates and describes the environmental conditions during sampling. Safety precautions and the method of collecting the sample to avoid contamination are highlighted. Furthermore, it explains how to observe and measure the physical and chemical properties of water, including temperature, color, odor, pH, EC, and TDS, using a hannameter instrument.
🧪 Recording and Preserving Water Samples
The second paragraph focuses on the procedures following the collection of water samples, specifically recording the sample's pH, EC, temperature, and TDS using a hannameter. It describes the filtration process using a syringe and filter, and the subsequent preservation of samples in isotope and HDPE bottles. Different preservation methods are mentioned depending on the type of analysis, such as adding strong acids for cation analysis or Zn acetate for sulfide analysis. The importance of promptly transporting the samples to the laboratory in a cooler box is stressed, and the paragraph concludes with instructions for storing backup samples in a glass bottle sealed with a rubber seal.
Mindmap
Keywords
💡Geochemical Water Sampling
💡Universal pH paper
💡Beaker glass
💡Filtering
💡Preserving
💡Hannameter
💡Total Dissolved Solids (TDS)
💡Isotope bottle
💡HDPE bottle
💡Safety
💡Backup sample
Highlights
Three general steps for geochemical water sampling: choosing location, collecting, and filtering/preservation.
Preparation of equipment and materials is the initial step before field observation and sample collection.
List of equipment needed includes universal pH paper, beaker glass, glass bottle with rubber seal, isotope bottle, HDPE bottle, filter, syringe, and water dipper.
Materials required for sampling are Aquadest, Zn acetate 2M, and nitric or hydrochloric acid.
Supporting equipment includes latex gloves, mask, and a hannameter instrument for measurements.
Determination of the sampling location using specific coordinates and elevation.
Description of the sampling point's geographical location in Code River, Sendowo, Sinduadi Village, Mlati District, Sleman Regency, Yogyakarta.
Water sampling conducted on October 22, 2020, under partly cloudy weather with a temperature of 28 degrees Celsius.
Rinsing of sampling equipment with water sample to prevent contamination.
Emphasis on safety during water sampling and the importance of collecting from flowing water to avoid sediment.
Observation of water's physical properties including temperature, color, odor, and electrical conductivity (EC).
Measurement of chemical properties such as pH and total dissolved solids (TDS) using a hannameter.
Instructions for maintaining the hannameter sensor and ensuring accurate readings.
Procedure for recording pH, EC, temperature, and TDS from hannameter readings.
Example results from the sample including pH 7.76, EC 376 micro Siemens, temperature 29.7 degrees Celsius, and TDS 189 ppm.
Filtering of water samples using a syringe and filter for lab analysis.
Preservation methods for water samples depending on the type of analysis, including adding strong acids for cation analysis.
Special preservation technique for sulfide analysis using Zn acetate.
Instructions for transporting samples to the laboratory in a cooler box for analysis.
Storage of backup samples in a glass bottle sealed with a rubber seal.
Transcripts
[Geochemical Water Sampling] In order to collect water sample for geochemical analysis, there are 3 steps in general
1. Choosing the sampling location
2. Collecting water sample
3. Filtering and preserving water sample
[The first step that must be done before conducting field observation and sample collecting..]
[..is to prepare equipments and materials]
[Preparing equipments and materials] The equipments needed to collect water sample are..
Universal pH paper
Beaker glass
Glass bottle & rubber seal
Isotope bottle
HDPE bottle
Filter
Syringe
Water dipper
And the materials needed are: Aquadest
Zn acetate 2 M
Nitric acid or hydrochloric acid
There are also supporting equipments, such as latex gloves and mask
And hannameter instrument
[The next step is to determine sampling location]
In this video, the sampling point is located at coordinate 49M 430567 E 914162 S with elevation 117 masl
This is located in Code River, Sendowo, Sinduadi Village, Mlati District, Sleman Regency, Daerah Istimewa Yogyakarta
500 m to the southwest of Geological Engineering Department, Gadjah Mada University
Water sampling was conducted on Thursday, 22 October 2020.
The weather was partly cloudy with temperature of 28 degree Celsius
[Next step: to collect the water sample]
Rinse the equipments that will be used for water sampling (i.e beaker glass and water dipper)..
..using the water sample for 3 times
This is to ensure that there are no contaminant that will alter the result of analysis
When conducting water sampling, please be careful and stay safe.
Remember, safety first.
Collect water sample using water dipper, rinse the water dipper using water sample for 3 times
It is better to collect the sample on flowing water to avoid accidentally picking up sediment or mud
After that, put the water into beaker glass to measure its physical & chemical properties
The observation of physical properties includes temperature, color, odor, and electrical conductivity (EC)
The measurement of chemical properties includes pH and total dissolved solid (TDS)
Color can be observed visually, whether the water is clear, brown, reddish, or showing another color
Odor can be observed by smelling directly, whether the water is odorless, or have smells of sulfur, ammonia, or any particular odor
Taste (if possible) is checked with the tip of the tongue, whether the water is tasteless, salty, bitter, or sour
The measurement of pH, temperature, EC, and TDS may be performed using hannameter
The initial step is to arranging the instrument
The liquid within hannameter sensor cap must not dry out to maintain a stable pH, so that the hannameter instrument remains in a standard state
Don’t forget to rinse all the equipment min. 3 times with water sample, for example this mini beaker glass
Put the water sample into beaker glass
Insert the hannameter sensor into the water
Next, record the pH, electrical conductivity, and TDS from hannameter reading
For this sample, we obtain pH 7.76, EC 376 micro Siemens, temperature 29.7 degree Celsius, and TDS 189 ppm
[The last step is to filter and preserve water sample ]
Sample filtering is conducted by taking the water sample using a syringe..
..and then install the filter to end of syringe, and filter the water
Put the filtered water sample into isotope bottle and 2 HDPE bottle
Water sample within HDPE bottle will be preserved using some methods, according to the type of analysis
For anion analysis (fluoride, chloride, bromide, nitrate, sulphate, etc), sample no need to be preserved
For cation analysis (sodium, potassium, calcium, etc), add strong acid (ie. nitric acid HNO3 or HCl) until pH < 2 is reached
To measure pH, dip pH to the water sample and compare the color with indicator until match
For sulfide analysis, add 1 drop of Zn acetate 2 M for every 25 ml of sample
Put all samples into cooler box and bring to laboratory as quickly as possible
For backup sample, put 1 L of water sample into glass bottle and seal with rubber seal
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