Hanna-instruments HI 96101 Manual do Utilizador descarregar pdf (Página 7)

7

PRECISION AND ACCURACY

Precision is how closely repeated measurements

agree with each other. Precision is usually

expressed as standard deviation (SD).

Accuracy is defined as the nearness of a test

result to the true value.

Although good precision suggests good accuracy,

precise results can be inaccurate. The figure

explains these definitions.

In a laboratory using a standard solution of the

parameter and a representative lot of reagent

(for each parameter) the following standard

deviations were obtained:

Parameter Standard Solution Standard Deviation

pH 7.0 pH 0.1 pH units

Free Chlorine 1.00 mg/L 0.03 mg/L

Total Chlorine 1.00 mg/L 0.03 mg/L

Cyanuric Acid 20 mg/L 1 mg/L

Iodine 2.5 mg/L 0.1 mg/L

Bromine 2.00 mg/L 0.08 mg/L

Iron LR 0.80 mg/L 0.01 mg/L

1 2 3 4 5 6 7 8 9 10 11 12 ... 35 36

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