Instrumentation Laboratory

2017 Topic: Iron in Water

OBJECTIVE

Utilize a colorimetric method to analyze and determine the concentration of iron in a water sample using spectrophotometric analysis.


Materials Provided byNJITon the Day of the Event

  • Sample of Water (Unknown)
  • ~ 1g ferrous ammonium sulfate hexahydrate
  • Graph paper to be used to make standard curve.

 

Materials & Methods Brought by Team to the Competition: 

  • All additional chemicals, materials & equipment deemed necessary by the team must be brought to the competition by the team. Make sure you have correct equipment to complete your procedure.  This may include a spectrophotometer as well as any glassware needed.
  • Prior to the competition, each team must provide the judges with a typed step-by-step description of the methods they intend to use to address the objective of this experiment.  
  • Make sure you have enough distilled water and any other supplies needed to successfully perform the analysis.
  • Correct lab safety equipment should include rubber gloves, apron, and safety goggles.

INSTRUCTORS NOTES ON SPECIAL SAFETY CONSIDERATIONS:

  • Laboratory should be supervised by instructor/coach at all times.  
  • Review all procedures for safety concerns.  
  • Teams will be permitted to perform their experiment only if their procedure is approved by the judges in accordance with safety protocols.
  • Safety protocol must be addressed in the team's procedure submitted for evaluation prior to event.
  • Teams must practice procedure prior to event day. Judges reserve the right to dismiss unprepared teams the day of the event.


Prior to the event:

A step-by-step Description of the Methods and Safety Protocol  must be received by the Director of the NJCO by the deadline indicated in the Requirement Overview. You must practice your procedure. Judges may disqualify entrants who are not confident about their procedure, and as a result pose a safety risk.  Review, be familiar with and be prepared to follow all safety guidelines associated with your chosen method.

Research appropriate small scale techniques, or microscale techniques. Lab manuals available from various scientific suppliers including Flinn Scientific, Inc. Furthermore, publications such as the Journal of Chemical Education may serve as sources for specific Microscale techniques.


​On the Day of the event:   

  • Obtain unknown water sample and use your team's procedure to quantify the iron concentration in the sample.
  • Glassware should be cleaned BEFORE coming to the event.
  • Create a standard curve and draw on graph paper provided.
  • Use the standard curve to determine iron concentration (mg/L) in the sample.
  • Clean up and then submit your results and calculations.
    • All samples provided must be returned.
    • Dispose of all waste products as instructed.
    • Bring adequate distilled/deionized water for conducting your experiments.


Time Limit:   75 minutes


Judging

  • Description of methods, 40%
  • Description of safety concerns addressed within procedure, 10%
  • Presentation of Data, Supporting Graph and Calculations 25%
  • Accuracy of iron concentration 25%
  • Time


Notes:

  • In the event of a tie, the team that completes this session in the shortest period of time will win the tie.
  • Teams must clean up and remove all materials that they bring to this event and return them to their own schools.  


ALL PARTICIPANTS MUST BRING (APPROVED) GOGGLES, GLOVES AND APRON OR LAB COAT, AND USE THEM AT ALL TIMES DURING THE COMPETITION.  STUDENTS MUST ADHERE TO BOTH GENERAL LAB SAFETY PROTOCOLS AND THOSE SPECIFIC TO THEIR CHOSEN PROCEDURE.