1.1 This practice describes a rapid test for determining sensory thresholds of any substance in any medium.<\/p>\n
1.2 It prescribes an overall design of sample preparation and a procedure for calculating the results.<\/p>\n
1.3 The threshold may be characterized as being either ( a<\/i> ) only detection<\/i> (awareness) that a very small amount of added substance is present but not necessarily recognizable, or ( b<\/i> ) recognition<\/i> of the nature of the added substance.<\/p>\n
1.4 The medium may be a gas, such as air, a liquid, such as water or some beverage, or a solid form of matter. The medium may be odorless or tasteless, or may exhibit a characteristic odor or taste per se.<\/p>\n
1.5 This practice describes the use of a multiple forced-choice sample presentation method in an ascending concentration series, similar to the method of limits.<\/p>\n
1.6 Physical methods of sample presentation for threshold determination are not a part of this practice, and will depend on the physical state, size, shape, availability, and other properties of the samples.<\/p>\n
1.7 It is recognized that the degree of training received by a panel with a particular substance may have a profound influence on the threshold obtained with that substance (1)<\/b> .<\/p>\n
1.8 Thresholds determined by using one physical method of presentation are not necessarily equivalent to values obtained by another method.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 1<\/td>\n | Scope Referenced Documents <\/td>\n<\/tr>\n | ||||||
| 2<\/td>\n | Terminology Summary of Practice Significance and Use Preparation of Concentration Scale <\/td>\n<\/tr>\n | ||||||
| 3<\/td>\n | Judgment Procedure Data Evaluation Report Precision and Bias <\/td>\n<\/tr>\n | ||||||
| 4<\/td>\n | Keywords X1. EXAMPLE NO. 1\u2014DIFFERENCE THRESHOLD OF ETHYL ACETATE ADDED TO BEER X1.1 X1.2 X1.3 X1.4 X1.5 Report TABLE X1.1 <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | X2. EXAMPLE NO. 2\u2014ODOR THRESHOLD DETERMINATION X2.1 X2.2 X2.3 X2.4 X2.5 Report TABLE X2.1 <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | X3. EXAMPLE NO. 3\u2014ODOR THRESHOLD DETERMINATION X3.1 X3.2 X3.3 X3.4 X3.5 Report X3.6 Additional examples TABLE X3.1 <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | REFERENCES <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" E679-04 Standard Practice for Determination of Odor and Taste Thresholds By a Forced-Choice Ascending Concentration Series Method of Limits<\/b><\/p>\n |