There are several methods to estimate the concentration (and, therefore, indirectly, the mass) of nanoparticles suspended in a solution, often called a nanoparticle colloid. Here are a few common methods:

Each method has its strengths and weaknesses, and the best method for you will depend on the specifics of your nanoparticles and your experimental setup. It may be necessary to use a combination of methods to obtain reliable results.

Dear Jerome Castillo Cornilla,

The choice of method depends on the specific requirements, characteristics, and nature of the nanoparticles. It is recommended to consult the literature, consider the sample properties, and select the appropriate technique based on the desired accuracy, sensitivity, and feasibility.

hope this will help you, thanks and regard