pH=9.5 ± 0.1 500ml
pH ≈10 500ml
pH=4.5 ± 0.1 500ml
pH=4.1 ± 0.1 500ml
pH=5.5 ± 0.1 500ml
pH =3.45 ± 0.05 1L
pH =3.5 ± 0.1 500ml
pH =4.7 ± 0.1 500ml
pH=5.00±0.1 500ml
pH ≈5.5 500ml
