1) The color of the water
In determining the true color, suspended materials that can cause turbidity separated beforehand. Filtration (filtration) aims to eliminate the material suspended in the water without compromising the authenticity of the color of the water. Centrifugation prevent interaction with the color filter material. True colors are not affected by turbidity. Water color can be used (not always) as a parameter whether a body of water has been polluted or not.
Water color can also be affected by biota therein, such as algae, plankton and aquatic plants. The river water is generally clear colorless to brown, this is because the body is affected by the leaching stream itself and content results in suspension therein. Color waters measured by organoleptic method, observations with the naked eye or with Visual Comparation Method is by comparing water samples with standard colors are made from elements of platinum (Pt) and cobalt (Co).
units of color is PtCo unit. for the sake of drinking water should have a color value of 5-15 PtCo. Water samples from the lake with a brownish yellow color value 200-300 PtCo. The deeper the water column it will show the color the higher the value, this is because the presence of organic materials dissolved in the bottom waters.
2) Light Intensity
The tools used are Lux meter. Where such a device is stored above sea level and then recorded values in Lux meter.
The water temperature was measured by using a thermometer that is the way to 3/4 the length thermometer dipping into the water. Organize the thermometer does not touch the body because the body temperature can affect the temperature on the thermometer. After it was allowed to stand a few minutes until it is certain pins are in a condition scale pointer does not move. Then determine the value of the temperature shown on the thermometer and record the results. When the water temperature the higher the levels of dissolved O2 will be lower, and vice versa. How it Works:
o Recorded air temperature around
o For surface water: The thermometer dipped into the water, wait a few minutes. Appointed and recorded temperature.
o For water below: Samples taken in the bottle, then the thermometer dipped into the water, wait a few minutes. Appointed and recorded temperature.
To measure turbidity with a turbidimeter uses the following ways:
o Bottled water containing the sample stirred with inverted manner in order to avoid sediment,
o Air samples were transferred to a test tube as much as 20-30 ml
o The test tube inserted into the turbidimeter and then the results are recorded.