Green Circle metric

The Metrics Green Star, Green Circle and Green Matrix... 

Figure 8.7 Holistic metrics based on the principles of green chemistry. The graphic metrics refer to an optimization experiment of the syntheses of tetram-minecopper(ii) sulfate monohydrate 16 (only ten of the twelve principles were used in the evaluation, principles 4 and 11 being excluded). When the excess of ammonia was deceased from 300% (top metrics) to 7% (bottom metrics), the green area in the graphics increased and the indexes API (green circle) and GSAI (green star) increased respectively from 30 to 50 and from 40 to 55.

The green circle is obtained by a similar procedure, the only difference being a simpler binary criterion (accomplishment/no accomplishment) for evaluation of the principles, where the intermediate level in the 1/3 scale of green star is included in the lower level (no accomplishment). The metric is presented as an Excel pie chart, where the colours green/red in the sectors are used to identify the accomplishment/no accomplishment of the principles. For comparison of different green circles, an accomplishment of principles index (API) may be calculated as the percentage of principles accomplished (API = 100 X number of principles accomplished/total number of principles that apply). 

---