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Optimal pH for Growth of Certain Bacteria

Organism Minimum pH Optimum pH Maximum pH
Thiobacillus thiooxidans 0.5 2.0-2.8 4.0-6.0
Sulfolobus acidocaldarius 1.0 2.0-3.0 5.0
Bacillus acidocaldarius 2.0 4.0 6.0
Zymomonas lindneri 3.5 5.5-6.0 7.5
Lactobacillus acidophilus 4.0-4.6 5.8-6.6 6.8
Staphylococcus aureus 4.2 7.0-7.5 9.3
Escherichia coli 4.4 6.0-7.0 9.0
Clostridium sporogenes 5.0-5.8 6.0-7.6 8.5-9.0
Erwinia caratovora 5.6 7.1 9.3
Pseudomonas aeruginosa 5.6 6.6-7.0 8.0
Thiobacillus novellus 5.7 7.0 9.0
Streptococcus pneumoniae 6.5 7.8 8.3
Nitrobacter sp. 6.6 7.6-8.6 10.0

Note: Most bacteria grow over a pH range of approximately 3 units