Table 1.
Detailed pH measurements of Group A's samples—Bottled Still Water brands, commercialized in Portugal, with pH < 5.2, 5.2 < pH < 5.5 and 5.5 < pH < 6.8
| Water brand | pH Sample 1 | pH Sample 2 | pH Sample 3 | pH Sample 4 | pH Sample 5 | pH mean value | Standard deviation |
|---|---|---|---|---|---|---|---|
| 7 FONTES® | 5.15 | 5.08 | 4.98 | 4.93 | 4.95 | 5.02 | 0.09 |
| ÁGUA SÃO MARTINHO® | 5.30 | 5.37 | 5.31 | 5.21 | 5.23 | 5.28 | 0.06 |
| ROCK WATER® | 5.32 | 5.32 | 5.33 | 5.36 | 5.32 | 5.33 | 0.02 |
| DIA® | 5.54 | 5.44 | 5.41 | 5.42 | 5.36 | 5.43 | 0.07 |
| SALUTIS® | 5.52 | 5.48 | 5.51 | 5.45 | 5.53 | 5.50 | 0.03 |
| VITALIS® | 5.52 | 5.51 | 5.54 | 5.55 | 5.46 | 5.52 | 0.04 |
| ARO® | 5.69 | 5.72 | 5.70 | 5.65 | 5.66 | 5.68 | 0.03 |
| LUSO® | 5.67 | 5.69 | 5.70 | 5.66 | 5.72 | 5.69 | 0.02 |
| SERRABRAVA® | 5.78 | 5.80 | 5.78 | 5.75 | 5.77 | 5.78 | 0.02 |
| CALDAS DE PENACOVA® | 5.85 | 5.78 | 5.80 | 5.80 | 5.79 | 5.80 | 0.03 |
| UP® | 5.93 | 5.92 | 5.87 | 5.90 | 5.88 | 5.90 | 0.03 |
| MARCA GUIA® | 6.05 | 5.95 | 6.00 | 5.81 | 5.78 | 5.92 | 0.12 |
| SERRANA® | 6.02 | 5.91 | 5.91 | 5.91 | 5.87 | 5.92 | 0.06 |
| FONTE DE AMORES® | 5.83 | 5.85 | 5.95 | 6.03 | 6.02 | 5.94 | 0.09 |
| CELEIRO® | 6.20 | 5.94 | 5.94 | 5.81 | 6.12 | 6.00 | 0.16 |
| FASTIO® | 5.96 | 5.95 | 6.13 | 6.08 | 5.97 | 6.02 | 0.08 |
| NESTLÉ® AQUAREL | 6.01 | 6.11 | 6.01 | 6.00 | 5.96 | 6.02 | 0.06 |
| PINGO DOCE® ‐ SERRA | 6.03 | 6.06 | 6.11 | 6.10 | 6.16 | 6.09 | 0.04 |
| ALCAFAZ® | 6.17 | 6.13 | 6.11 | 6.11 | 6.15 | 6.13 | 0.03 |
| NATURIS® | 6.29 | 6.18 | 6.08 | 6.14 | 6.18 | 6.17 | 0.08 |
| ALARDO® | 6.26 | 6.15 | 6.08 | 6.14 | 6.27 | 6.18 | 0.08 |
| MILFONTES® | 6.17 | 6.17 | 6.16 | 6.17 | 6.24 | 6.18 | 0.03 |
| CONTINENTE® | 6.33 | 6.34 | 6.35 | 6.32 | 6.36 | 6.34 | 0.02 |
| A PADARIA PORTUGUESA® | 6.44 | 6.39 | 6.33 | 6.35 | 6.32 | 6.37 | 0.05 |
| PINGO DOCE® ‐ FH6 | 6.67 | 6.45 | 6.42 | 6.37 | 6.40 | 6.46 | 0.12 |
| SPRING PORTUGAL® | 6.49 | 6.51 | 6.48 | 6.45 | 6.49 | 6.48 | 0.02 |
| SERRA DA ESTRELA® | 6.58 | 6.28 | 6.46 | 6.54 | 6.64 | 6.50 | 0.14 |
| CARAMULO® | 6.44 | 6.50 | 6.52 | 6.54 | 6.56 | 6.51 | 0.05 |
| SERRAS DE FAFE® | 6.52 | 6.57 | 6.50 | 6.54 | 6.53 | 6.53 | 0.03 |
| PINGO DOCE® ‐ Nascente GLACIAR | 6.50 | 6.56 | 6.55 | 6.54 | 6.57 | 6.54 | 0.03 |
| NUMEN® | 6.53 | 6.54 | 6.54 | 6.56 | 6.56 | 6.55 | 0.01 |
| VIMEIRO® LISA | 6.57 | 6.57 | 6.54 | 6.57 | 6.55 | 6.56 | 0.01 |
| SERRA DA PENHA® | 6.57 | 6.49 | 6.53 | 6.68 | 6.56 | 6.57 | 0.07 |
| AUCHAN® | 6.76 | 6.69 | 6.65 | 6.55 | 6.64 | 6.66 | 0.08 |
| FONTE DA NATUREZA® | 6.64 | 6.66 | 6.65 | 6.68 | 6.69 | 6.66 | 0.02 |
| SPA WATER® | 6.73 | 6.69 | 6.63 | 6.66 | 6.62 | 6.67 | 0.05 |
| LOS RISCOS® | 6.44 | 6.86 | 6.69 | 6.82 | 6.70 | 6.70 | 0.16 |
| FEATHER WATER® | 6.74 | 6.73 | 6.71 | 6.72 | 6.74 | 6.73 | 0.01 |
| CARVALHELHOS® | 6.64 | 6.70 | 6.85 | 6.72 | 6.76 | 6.73 | 0.08 |
| RIK&ROK® | 6.58 | 6.72 | 6.76 | 6.79 | 6.93 | 6.76 | 0.13 |
| VOLVIC® | 6.51 | 6.79 | 6.90 | 6.86 | 6.78 | 6.77 | 0.15 |
| HEALSI® | 6.81 | 6.80 | 6.78 | 6.78 | 6.77 | 6.79 | 0.02 |