Hanna-instruments HI 4009 Manual de usuario descargar pdf (Pagina 6)

capped plastic bottle. Using volumetric pipettes and glass-

ware make dilutions to bracket the concentration of the

samples. Store standards in plastic bottles. Standards with

concentrations < 10

-3

M should be prepared daily. One mL

of Hanna ISA and pH adjuster (HI 4001-00) should be

added to each 100 mL of sample or standard.

VIIVII

VII.

General GuidelinesGeneral Guidelines

General Guidelines

• Use of a hood and protective clothings is strongly

advised. Use ISA to adjust pH above 11.

• Calibration standards and sample solutions should

have the same ionic strength. ISA should be added to

both samples and standards in the same ratio. 1 part

ISA to 100 parts standard is the normal dosing.

• Concentrated samples (>.005 M) should be diluted

before measurement. Multiply the final result by the

corresponding dilution factor.

• For high ionic strength samples, use standard addi-

tion or titration methods.

• Calibration standards and sample solutions should

be at same temperature and at elevated pH.

• The magnetic stirrer may generate heat. Thermally

insulate beaker containing standard or sample from

magnetic stirrer by placing cork or other insulative

sheet between beaker and stirrer plate.

• Calibration standards and sample solutions should

be stirred at the same rate using identical sized TFE

coated stir bars.

• Rinse electrode pair with distilled or deionized water

between samples and gently dab dry with soft dis-

posable absorbent toweling. Do not rub electrodes.

• Presoaking cyanide sensor in a dilute standard will

optimize response. Use concentrations approximately

-3

M or less with ISA added.

• A scratched, pitted, or tarnished pellet surface can

cause drift, a loss of low level response, or poor repeat-

ability. Optimum response can be restored by remov-

ing the damaged surface with the microabrasive strip

1 2 3 4 5 6 7 8 9 10 11 ... 15 16

Comentarios a estos manuales

Sin comentarios

Hanna-instruments HI 4009 Manual de usuario Pagina 6

Comentarios a estos manuales

Relacionado con productos y manuales para Instrumentos de medición Hanna-instruments HI 4009