Lovibond Tintometer MD 100 Manual De Instrucciones página 45

Iron in Mo PP (224) / M224
Iron in Mo PP (224)
0.01 - 1.8 mg/l Fe
TPTZ
Material
EN
Required material (partly optional):
Reagents
VARIO Fe in MO Reagent Set
Sampling
1. Samples are to be collected in clean glass or plastic bottles. These should have been
cleaned with 6 N (1:1) Hydrochloric acid and then rinsed with deionised water.
2. To preserve samples for later analysis, the pH value of the sample must be adjusted
to less than 2. Approximately 2 ml per litre of concentrated Hydrochloric acid can be
added to the sample. the sample is tested immediately, this addition is not necessary.
3. If determination of dissolved Iron is required, the sample must be filtered through a
0.45-micron filter or equivalent medium immediately after it has been collected and
before acidification.
4. Preserved samples should be stored no longer than 6 months at room temperature.
5. The pH is to be adjusted to 3–5 by adding 5 N Sodium hydroxide solution before the
analysis. A pH value of 5 must not be exceeded, since this can lead to precipitation of
iron.
6. The test result needs to be corrected on the basis of the volume additions.
Preparation
1. All glassware is to be cleaned with cleaning detergents and then rinsed with tap
water. Afterwards, it should be reclaimed with Hydrochloric acid (1:1) and deionised
water. These steps will remove any deposits that may cause slightly higher results.
2. If the sample contains 100 mg/L or more Molybdate (MoO
must be taken immediately after zeroing the device.
3. For more accurate results, a reagent blank value can be determined for each new
batch of reagent. Follow the procedure set out, using deionised water instead of the
sample. The measured value that is obtained should be /subtracted from the readings
of these results.
Notes
1. A blue colour develops in the presence of iron. A small amount of undissolved
powder has no influence on the result.
46
Packaging Unit
1 Set
) then the sample reading
2-
4
EN Method Reference Book 1.0
M224
FEM
Part Number
536010