Table 4.
Class profiles, thresholds and preferences directions for criteria used in SMAA-TRI (*: the numbers within brackets indicate the code used for the value of each criterion).
| Class profiles | g1 | g2 | g3 | g4 | g5 | g6 | g7 | g8 | |
|---|---|---|---|---|---|---|---|---|---|
| Reducing agent code | Capping agent code | Solvent code | Local resource use code | Reaction time (seconds) | Temperature (Celsius) | Equipment type code | Size range code | ||
| Case A: Certain | b4 = C5 − C4 | Renewable – primary (3*) | Renewable – waste (4) | Renewable – primary (3) | Yes (1) | 50 | 30 | Stirring ≤ 5 min (7) | 0 ≤ particle size ≤ 30 nm (1) |
| b3 = C4 − C3 | Renewable – primary (3) | Renewable – primary (3) | Renewable – primary (3) | Yes (1) | 100 | 40 | Stirring (6) | 0 ≤ particle size ≤ 60 nm (2) | |
| b2 = C3 − C2 | Biodegradable polymer (2) | Renewable – primary (3) | Biodegradable polymer (2) | No (0) | 400 | 60 | Microwave – sealed vessel (>300 W) (4) | 30 < particle size ≤ 60 nm (3) | |
| b1 = C2 − C1 | Synthetic (1) | Biodegradable polymer (2) | Synthetic (1) | No (0) | 1500 | 95 | Conventional (2) | 0 < particle size ≤ 100 nm (4) | |
| Case B: Uncertain | b4 = C5 − C4 | 3.0–3.5 | 4.0–4.5 | 3.0–3.5 | 1 | 35–75 | 25–35 | 5–7 | 1 |
| b3 = C4 − C3 | 2.5–3.0 | 3.5–4.0 | 2.5–3.0 | 1 | 75–125 | 35–50 | 4–5 | 2 | |
| b2 = C3 − C2 | 2.0–2.5 | 3.0–3.5 | 2.0–2.5 | 0 | 125–675 | 50–80 | 3–4 | 3 | |
| b1 = C2 − C1 | 1.0–2.0 | 1.0–3.0 | 1.0–2.0 | 0 | 675–2250 | 80–115 | 2–3 | 4 | |
| Indifference threshold | 0 | 0 | 0 | 0 | 10 | 5 | 0 | 0 | |
| Preference threshold | 1 | 1 | 1 | 0 | 30 | 10 | 1 | 1 | |
| Criterion preference | ↑ | ↑ | ↑ | ↑ | ↓ | ↓ | ↑ | ↓ | |