Lovibond Tintometer MD 100 Manuel D'instructions page 6

Hazen 24
10 - 500 mg/L Pt
(APHA) Platinum Cobalt Standard
Method
Material
EN
Required material (partly optional):
Reagents
no reagent required
Preparation
1. Sample collection, preservation and storage:
Pour the water sample into clean glass or plastic containers and analyse as soon
as possible after the sample is taken. If this is not possible, fill the container right up
to the top and seal tightly. Do not stir the sample and avoid lengthy contact with the
air. The sample may be stored in a dark place at a temperature of 4 °C for 24 hours.
Before carrying out any measurements, the water sample should be brought up to
room temperature.
Notes
1. This colour scale was originally developed by A. Hazen as a visual comparison
scale. It is therefore necessary to ascertain whether the extinction maximum of the
water sample is in the range between 420 and 470 nm, as this method is only suitable
for water samples with yellowish to yellowish-brown colouration. Where applicable,
a decision should be made based on visual inspection of the water sample. 2. This
method is calibrated on the basis of the standards specified by "Standard Methods for
the Examination of Water and Wastewater" (also see EN ISO 7887:1994).
Pt-Co colour unit ^= 1 mg/L of platinum as chloroplatinate ion 3. Colour may be
expressed as "true" or "apparent" colour. The apparent colour is defined as the colour of
a solution due to dissolved substances and suspended particles in the sample.
This manual describes the determination of true colour by filtration of the water sample.
To determine the apparent colour, non-filtrated deionised water and sample are
measured. 4. The estimated detection limit for this method is 15 mg/L Pt.
6
Hazen 24 / M204
Packaging Unit
EN Method Reference Book 1.0
M204
PtCo
Part Number