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MPHL : DEC General Chemistry

 ​

 
 
Shahla Ameli — Supervisor
 
Purpose
 
The GENERAL CHEMISTRY SECTION provides analytical and technical services in the testing of samples for physical and aggregate properties, non-metallic inorganic compounds and organic aggregate constituents to help determine the suitability of drinking water for human consumption, effectiveness of wastewater treatment systems, and the quality of the Chesapeake Bay and its tributary waters. It also analyzes samples suspected of having toxic or hazardous effects.   The testing is performed using a variety of state of the art instruments. This section also measures the Biochemical Oxygen Demand and chlorophyll content of water collected from the Chesapeake Bay and its tributaries.  The chlorophyll content of water is an important indication of the activity of algae and other organisms whose growth has harmful effects on water and wildlife. 
 
Instrumentation
 
• Lachat 8000 and 8500 series FIA
• Mantech PC Titrate
• Shimadzu Spectrophotometer
• Shimadzu Spectrofluorophotometer
• Mantech AutoMax BOD Analyzer
• Shimadzu TOC-V Analyzer
• Hach 2100AN Turbidimeter
• Distillation apparatus for phenol
• Spe-Dex 300 for oil and grease
• Exeter CE440  Elemental Analyzer

 

CE 440 Elemental Analyzer
   


Mantech Liquid Handler
TOC –V Analyzer
 
Elements Routinely Analyzed
 
Tests are performed using a variety of wet chemistry instrumentations. Testing techniques covered in this section include:
 
TEST / MATRIX CONTAINER SAMPLE SIZE Preservation PRESERVATION METHOD
Alkalinity Plastic 500 mL 4° C 14 days APHA/
SM 2320 B
B.O.D. Plastic 1000 mL 4° C 48 hours EPA 405.1
T.O.C. Plastic 500 mL 4° C pH < 2 28 days EPA 415.2
Chloride Plastic 500 mL None 28 days EPA 325.2
Chlorophyll Filter na - 20° C, Dark 30 days EPA 10200
Color Plastic 500 mL 4° C 48 hours EPA 110.2
Conductance specific Plastic 500 ml 4° C 28 days EPA 120.1/
SM 2510
Cyanide, Amenable Plastic 500 mL NaOH, 14 days EPA 335.1
pH >12
Cyanide, Total Plastic 500 mL NaOH, 14 days EPA 335.2
pH >12
Fluoride Plastic 1L None 28 days APHA/
SM 4500-FC
MBAS (detergents) Plastic 500 mL 4° C 48 hours EPA 425.1
Oil and Grease Glass, Teflon cap 1 L 4° C 28 days EPA413.1/1664
H2SO4, pH <2
pH soil Glass 8 oz 4° C Immediately EPA 150.1
Phenol Glass Teflon cap 1L 4° C4° C 28 days EPA 420.1
H2SO4, pH <2
Solids  
(residue)
Dissolved Plastic 500 mL 4° C 7 days EPA 160.1
Total Suspended Plastic 500 mL 4° C 7 days EPA 160.2
Settleable Plastic 500 mL 4° C 48 hours EPA 160.5
Total Plastic 500 mL 4° C 7 days EPA 160.3
Volatile Plastic 500 mL 4° C 7 days EPA 160.4
Sulfate Plastic 500 mL 4° C 28 days EPA 375.2
Total Petroleum Hydrocarbons Glass 1 L 4° C 28 days EPA 1664
H2SO4 or
HCl, pH <2
Turbidity Plastic 500 mL 4° C 48 hours EPA 180.1
 
 
 
Proper measurement techniques, calibration, verification, and troubleshooting strategies for each parameter are addressed and good laboratory practices are emphasized.
 
  
Potential Health Concerns and Environmental Concerns
 
Chemical analyses determine the suitability of drinking water for human consumption, effectiveness of wastewater treatment systems, and the quality of the Chesapeake Bay and its tributary waters. It also analyzes samples suspected of having toxic or hazardous effects.
  
 
 
 

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