On-site measurement of anions - Determination of Anions in Natural and Treated Waters - page 763

0.024-2.4

Phosphate
silicate

1-10
(P 2 O 5 ) 0.3-
3(SiO 2 )

1

Sulphate 200-1600 10019

25-300

25-300

10-600

Sulphide (lead
acetate paper)

9511

Sulphite 10-500 10013

2.5-200/2.5 11148

Source: Own files

test solutions, reagents and accessories as a test is being performed. Short-tube and long-
tube test kits are available. The different path lengths allow for lower and higher
sensitivities.

Microquant Test Kits

There is often a need for a rapid colorimetric test in a medium sensitivity range roughly
equivalent to that covered by the Aquamerck and Aquaquant short tube tests, but which
will also permit coloured or turbid samples to be measured. The Microquant tests, which
work with transmitted light, are eminently suitable for this type of analysis.

Spectroquant Analysis System

This comprises an SQ 115 digital photometer a TR 205 Thermoreactor for elevated
temperature test, 100 and 148°C and the Spectroquant test kits. The SQ 115 photometer
measures absorbance and concentration in the range 370-1000nm. The photometer is
conveniently calibrated with calibration cells, which incorporate transparent coloured
windows to simulate standard solutions of precisely defined concentrations. The
inconvenience of calibrating against standard solutions and the unreliability of using
calibration factors are thus avoided.
Merck also supply compact laboratories consisting of packs of reagent bottles and
accessories. These include the determination of carbonate, nitrite and nitrate.

Palintest Rapid Test Kits

These are available in a visual test form (tablet count, colour match and turbidity tests) or
as a spectrophotometric version using the Palintest Photometer 5000 (Table 16.2).
Palintest also supply swimming pool and spa test kits for the determin-ation of alkalinity