Patent ID: 11860151
Assignee: nan
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 9:
10. Method according to claim 9 characterized by the fact that said soil samples are subjected to a pre-treatment comprising the additional phases of:
sifting with a sieve with a 10 mm metal mesh,
transfer of the sifted sample to a transparent glass test tube,
neutralization of the sample with sodium hydroxide 1M following a first stage of acid digestion with strong acid, in a ratio of 1:1 m/v or v/v with the abovementioned sample, for a duration of at least 24 hours at a temperature of 60° C.,
vacuum filtration by means of a filtering membrane in mixed cellulose esters with a porosity of 10 μm or 100 μm.