Sample Cell Matching - Hach DR/700 Procedures Manual

Warning labels also appear on some of the apparatus used with the test
procedures. The protective shields with the COD Reactor and the
Digesdahl Digestion Apparatus point out potential hazards. Be sure
these shields are in place during use and observe the precautions they
recommend.
Wear Protective Clothing: Protective clothing should be worn when
handling chemicals that cause irritation or burns. When caustic
materials are being used, eye protection, in particular, is important to
guard against spattering and splashes from accidental spills.
Use tongs or finger cots when transferring hot apparatus.
Use Mechanical Pipettors: Never pipet by mouth. Mouth pipetting
could result in accidentally ingesting a dangerous chemical. Make a
habit of using mechanical pipetting devices for all pipetting. Mistakes
that could cause serious injury will be avoided.
Use Special Care With Dangerous Chemicals and Apparatus:
Follow the test procedure steps carefully and observe all precautionary
measures. It is good practice to read the entire procedure carefully
before beginning the procedure. Use the safety equipment—such as
pipet fillers, protective clothing and ventilating hoods—appropriate for
the test being conducted. Wipe up all spills promptly. Do not smoke or
eat in an area where toxic or irritating chemicals are used. Use reagents
and apparatus only as they were meant to be used and use them only as
directed in the test procedure. Damaged labware and malfunctioning
equipment should not be used.
If accidental skin contact with hazardous chemicals occurs, flush the
contacted area with water for 15 minutes. Call a physician if necessary.
A MSDS (Material Safety Data Sheet) accompanies the first shipment of
all products. Refer to the MSDS for safety data essential for day-to-day
operations and safety training.

Sample Cell Matching

The sample cells provided with the DR/700 Colorimeter are not
optically perfect. Glass imperfections can introduce an error in the true
absorbance or percent transmittance measurement. In turn, the true
Absorbance or % T error can result in reduced accuracy. For optimum
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