Statistics for Environmental Engineers

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Abs.


COD


Abs.


COD


Abs.


COD


Abs.


60


0.30


140


0.70


375


1.80


525


2.50


70


0.30


195


0.95


375


1.65


550


2.20


90


0.35


250


1.30


380


1.70


550


2.30


100


0.45


250


1.50


450


1.75


550


2.50


100


0.70


300


1.60


480


1.50


550


2.70


120


0.50


300


1.65


500


2.30


600


2.35


130


0.48


350


1.70


500


2.45


650


2.45


130


0.70


350


1.80


525


2.35


675


2.70

Source: Briggs and Gatter (1992). ISA Trans., 31, 111-123.


36.4 TSS Measurement. The data below are for calibration of an instrument to measure total suspended solids (TSS) in wastewater. The data were obtained by reading the instrument and simultaneously grabbing a wastewater sample for a later analysis. Derive the calibration curve for instrument signal as a function of TSS. Discuss how this method of calibrating an instrument differs from usual practice.


Signal


TSS


Signal


TSS


Signal


TSS


Signal


TSS


30


94


60


58


80


40


100


34


40


80


60


62

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