Table 4 The measured pH values of the various solutions.

From: Heavy metal removal using an advanced removal method to obtain recyclable paper incineration ash

Agent solutions

Condition

Distilled water

EDTA

CA

OA

HCl

MS modea

S1 modeb

S2 modec

Solution agent

7.52

4.54

1.95

1.18

1.17

1.46

4.54

1.18

1.18

4.54

Solution including ash

13.10

12.30

12.50

12.12

11.96

12.00

12.50

12.30

12.43

12.45

  1. aRemoval using EDTA and OA simultaneously.
  2. bFirst step: EDTA; second step: OA.
  3. cFirst step: OA; second step: EDTA.
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