Taking into account that in the market a wide variety of products are find that contains/releases metal nanoparticles, topical become researches on it impacts on the environment and human health. Important step is the development of testing methodology to monitor the quantity of nanoparticles that get into the environment from nanoparticles containing materials. The study discusses the methods based on the use of conductivity measurements for textiles, testing with nano-size metal oxides content to determine the persistence of nanoparticles after textile washing. Taking into account the results of the experiment, measurements taken with the conductometer are fairly stable and repeatable, the equipment is suitable for measurements in distilled water with added zinc oxide or titanium dioxide nanoparticles. The measurements of the solution's specific electric conductance allows to pinpoint the nanoparticle concentration, but for this purpose, must be created the database that contains the resources needed for the calculations and methodology for sample preparation.