EXERCISE 7: GRAVIMETRIC ANALYSIS Flashcards
used to determine the mass or concentration of a substance by measuring a change in mass
Gravimetric analysis
the method used when the signal is the mass of a precipitate
precipitation gravimetry
the analyte is deposited as a solid film in an electrode in a electrochemical cell
Electrogravimetry
uses thermal or chemical energy to remove a volatile species in a sample’s matrix
volatilization gravimetry
the analyte is separated from the sample’s matrix using filtration or an extraction
particulate gravimetry
commonly used to analyze the total solids, total suspended solids and volatile suspended solids in water and wastewater samples
Particulate gravimetry
are dissolved solids plus suspended and settleable solids in water
TOTAL SOLIDS
calcium, chlorides, nitrate, phosphorus, iron, sulfur, and other ions particles that will pass through a filter with pores of around 2 microns (0.002 cm) in size
include silt and clay particles, plankton, algae, fine organic debris, and other particulate matter. These are particles that will not pass through a 2-micron filter
Suspended solids
TRUE OR FALSE
An organism placed in water with a very low level of solids, such as distilled water, will swell up because water will tend to move into its cells, which have a higher concentration of solids.
TRUE
TRUE OR FALSE
An organism placed in water with a high concentration of solids will shrink somewhat because the water in its cells will tend to move out.
TRUE
affect water clarity
TOTAL SOLIDS
Sources of total solids include
industrial discharges, sewage, fertilizers, road runoff, and soil erosion
FORMULA FOR TOTAL SOLIDS AND TOTAL SUSPENDED SOLIDS
mg total solids/L = (A-B) x 100
A = weight of dried residue + dish, mg
B = weight of dish, mg
