Pri vseh operacijah se pri analitskih metodah, ki vključujejo pripravo raztopin, razredčevanje, spiranje in izpiranje, pri katerih narava uporabljenega topila ali razredčila ni navedena, uporablja voda.
Any operation involving preparation of solutions, dilution, rinsing or washing, mentioned in the methods of analysis without indication as to the nature of the solvent or diluent employed, implies that water must be used.