Turbidity Lab Report using Advanced Turbidity Meter

Scope

The purpose of the test is to use nephelometry to determine the turbidity of a given sample & the purpose of this article is Turbidity Lab Report.

Significance

From an aesthetic standpoint, turbid water is unappealing. The murky waters will make consumers hesitant to drink them. Water treatment systems are hampered by turbid waterways. The filters’ efficiency is lowered. Pathogenic organisms will take shelter between particles and will not be eliminated, affecting disinfection.

Theory

Turbidity is a measurement of a liquid’s relative clarity. When a light is shined through a water sample, it is a measurement of the amount of light dispersed by material in the water. The turbidity increases as the intensity of scattered light increases.

Clay, silt, extremely small inorganic, and organic materials, algae, dissolved colored organic compounds, plankton, and other microscopic organisms all contribute to the turbidity of water.

Suspended particles such as clay, silt, finely divided organic debris, and microscopic organisms cause turbidity in water. When light passes through a turbid sample, some of the light is dispersed by the particles. The scattering of light is proportional to the turbidity in most cases. The amount of light scattered by a sample is thus used to determine its turbidity, with a standard turbidity suspension serving as a reference. The Jackson turbidity unit (JTU) and the Nephelometric turbidity unit (NTU) are turbidity units (NTU).

Water quality and turbidity

Particulate matter concentrations above a certain threshold impair light penetration, biological productivity, recreational values, and habitat quality, as well as cause lakes to fill up more quickly. Increased sedimentation and siltation can occur in streams, causing harm to fish and other aquatic life habitat regions. Other contaminants, such as metals and microorganisms, can bind to particles as well. As a result, turbidity readings can be utilized as a warning sign of impending pollution in a body of water.

Human health and turbidity

Excessive turbidity, or cloudiness, in drinking water is not only unsightly, but it can also be harmful to your health. Pathogens can find food and refuge in turbidity. If not addressed, the causes of excessive turbidity can foster pathogen regrowth in the water, leading to waterborne disease outbreaks that have resulted in widespread intestinal illness in the United States and around the world.

Despite the fact that turbidity is not a direct predictor of health risk, multiple studies have found a close link between turbidity reduction and protozoa eradication. Turbidity particles provide “shelter” for microorganisms by decreasing their exposure to disinfectant attacks. Microbe survival is thought to be aided by microbial adhesion to particulate particles.

Fortunately, when used correctly, standard water treatment technologies may successfully eliminate turbidity. (Source: Environmental Protection Agency of the United States of America)

Apparatus

• A turbidity meter is a device that measures the amount of turbidity

• Tubes for collecting samples

• Turbidity solutions with a reference standard

Procedure

  1. Turn on the turbidity meter and wait a few minutes for it to warm up.
  1. Measure the turbidity of the reference standard solutions by shaking the standard solution in the cell/bottle before placing it in the sample chamber/holder.
  2. If there is a variation in the reading of the reference solution, use the calibration switch to calibrate the instrument.
  3. Shake the sample before placing it in the sample chamber/holder and recording the sample’s turbidity.

Calculation and Observation

  Sample  Sample SourcePhysical AppearanceTurbidity (NTU)Temperature
1      
2      
3      
4    

Observations:

Turbidity

NomenclatureTurbidity (NTU)Temperature (deg)Classification
Sample 117.6419.2Cloudy
Sample29419.4 Vey cloudy
Sample312419.4Very cloudy

Precautions

  1. After using the probes and chemical, they should be covered.
  2. Don’t disturb the sample while it’s being read, and give it a good shake before using.
  3. Wait for the reading to level out.
  4. Follow proper safety procedures when handling chemicals and samples.

Practical Application

A turbidity is a good tool for determining the ‘quality’ of water in a sample because it is a measure of water clarity.

The typical drinking water is pure and colorless, with a very low turbidity value – almost nil. Above-average turbidity levels could suggest the presence of bacteria, pathogens, or particulates that aren’t visible to the naked eye.

Download Environmental Engg lab notes: https://coolcivilengineering.com/environmental-engineering-lab-notes/

Other uses for turbidity measurements include monitoring the quality of water in rivers and streams and its effects on aquatic life, as well as determining the turbidity of wastewater effluent to check for hazardous microorganisms.

Turbidimetric measurements are also used in the chemical, food, and beverage industries, as well as in other labs for research.

Standard Turbidity Values

The standard values for turbidity which are usually measured by turbidity meter should be ideally 0 and less than 5 for drinking water as per WHO Standards.

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