The turbidity is determined by an automatic turbidimeter
(2100 PTURBIMETER HACH).
The same material that is transported by the flow must be used for the turbidimeter
calibration, and the samples obtained must have the same amplitude of the SSC that may occur in the flow, to avoid the extrapolation of the calibration curve.
On the other side of the outlet nozzles, an online turbidimeter
, HACH) and particle counter (PC 2400 PS, CHEMTRAC) were installed to obtain time series data.
Serum peak and trough levels were measured using a turbidimeter
AutoAnalyzer (Cobas Mira, Roche, Switzerland).
The turbidity was measured using a turbidimeter
(Quimis[R] Q-279PiR-TCR) with the Nephelometric method.
Comparisons between measurements of turbidity in the study area (taken with a Hach Model 2100P turbidimeter
; Hach Company, Loveland, Colorado) agreed well with continuous data from the gaging station (M.
The turbidity was determined by means of 2100P HACH turbidimeter
. The colour (according to Pt scale), total iron, iron (II) concentrations were determined with the Dr 3900 (HACH Lange) spectrophotometer.
is used where more scientific data is required, but for local use, Secchi disc readings can provide a simple and quick understanding of whether the water is clear enough to swim and play safely.
Whereas turbidity was obtained by a microprocessed Plus II turbidimeter
, transparency was obtained with a Secchi disk.
In this article it was shown how an integrated circuit of amplified photodiode might speed up development of turbidimeter
. An inexpensive transducer which is also easy to reproduce is result of this research.
APHA 2130B and 2340-B methods were employed in the determination of turbidity (HACH 2100AN turbidimeter
) and total hardness of water samples, respectively.
Temperature and water quality parameters, including turbidity (nephelometric turbidity units, NTU, 2100P Turbidimeter
, Hach Company, Loveland, CO), dissolved oxygen (mg [O.sub.2]/ 1), conductivity ([micro]S/cm), and pH, were measured approximately every three days during the first 2 wk in all tanks with a YSI Professional Plus hand-held meter (YSI, Incorporated, Yellow Springs, OH) that was calibrated before use.