The Standard Guide for Time-Intensity Evaluation of Sensory Attributes (ASTM E1909) has been reapproved and is now available with the name E1909-13(2017). This standard is developed by the Committee E18.03, who this time decided to leave the text of the document as is.
The purpose of time-intensity measurements is to establish the pattern of development and decline of a particular sensory characteristic under study. T-I evaluations are applicable when measurements at a single time point (an averaging process) are not sufficient to distinguish products that have very different temporal characteristics.
This guide utilizes a specially trained panel to measure the intensity of a single continuous sensation during the time from initial exposure to its extinction, to a specified intensity, or to a predetermined limit of time.
This Standard is developed for product testing, so it has little use in environmental metrics. However, who says that we cannot use this standard to evaluate the decay of the odour intensity in a pile of compost? for example.
More info about the ASTM E1909-13(2017), Standard Guide for Time-Intensity Evaluation of Sensory Attributes here.