A method for monitoring an amount of a chemical material that includes: providing an at least one portable container; and providing into the at least one portable container a first amount of the chemical material. The method includes operatively associating a sensor with the at least one portable container, the sensor effective to detect a first level of the chemical material in the at least portable container and to generate a first data signal based on the first level. The method includes operating the sensor to detect a change in the amount of the chemical material in the at least one portable container, and thereby to generate a second data signal based on the change. The method includes using a processor in operable communication with the sensor.