EN 12662 Liquid petroleum products - Determination of total contamination in middle distillates, diesel fuels and fatty acid methyl esters
5 Reagents and materials
5.1 Heptane, with a purity no less than 99.0 % (V/V), filtered using a membrane filter (6.18).

NOTE Heptane used as a reference fuel in EN ISO 5164 is suitable.

5.2 Xylene, analytical grade, filtered using a membrane filter (6.18).

5.3 Propan-2-ol, with a purity no less than 99.0 % (V/V).

NOTE Propan-2-ol is used to dry glassware and the sample container after rinsing with water.

5.4 Solvent, add 750 ml heptane (5.1) and 250 ml xylene (5.2) to a 1 l glass bottle (6.5) and mix thoroughly.

6 Equipment
All glassware and sample containers shall be carefully cleaned as described in Clause 7.

Usual laboratory apparatus and glassware, together with the following:
6.1 Filtration apparatus, suitable for a filter (6.2), as shown in Figure 1.
A different filtration apparatus may be used if it is suitable to take the filters given in 6.2.

6.2 Filters, of high retention glass fibre type, 47 mm in diameter and with a 0.7 μm mean pore size.

NOTE Glass fibre filters Whatman GF-F type have been found suitable for total contamination measurements. This information is given for the convenience of users of this European Standard and does not constitute an endorsement by CEN of this product.

6.3 Beakers, tall form 0.5 l and 1 l, conforming with ISO 3819 or an equivalent national standard.

6.4 Cylinders, 500 ml and 1 000 ml graduated cylinders.

6.5 Glass bottles, 0.5 l and 1 l, with screw caps.

6.6 Oven, of the static type (without fan assisted circulation), explosion-proof, capable of heating to (110 +/- 5) °C.

6.7 Desiccator, containing freshly activated silica gel (or equivalent desiccant) with a moisture content indicator.

6.8 Glass Petri dishes with covers, greater than 50 mm in diameter.

6.9 Analytical balance, capable of weighing to the nearest 0.1 mg.

6.10 Forceps, with round shaped tips for transferring the filter from the filter holder to the Petri dish and from the latter on to the dish of the analytical balance.

6.11 Water bath or oven, capable of maintaining the following temperatures: (40 +/- 1) °C and (60 +/- 1) °C.

6.12 Wash bottle, fitted with spray nozzle, suitable for use with heptane (5.1).

6.13 Top load balance, capable of weighing 1500 g to the nearest 0.1 g.

6.14 Vacuum source, capable of maintaining an absolute pressure of 2 kPa to 5 kPa inside the filtration apparatus (see Figure 1).

NOTE The vacuum range excludes the use of a water vacuum pump.

6.15 Suitable clean sample containers.

6.16 Stopwatch, capable of measuring 30 min +/- 1 min.

6.17 Clean plastic film or aluminium foil.

6.18 Filter, membrane with a mean pore size of 0.45 μm.