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Created: 2025/09/16 17:19
share_link: https://share.note.sx/mv3cnffm#/4vjwTmvECFy6s4kull2T9mRjjD3b0LwwS9Vc7WlDmA
share_updated: 2025-09-22T11:32:55+06:00
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**Determination of CO<sub>2</sub> in Water:**

| Initial Reading (mL) | Final Reading (mL) |
| -------------------- | ------------------ |
| 13.6                 | 14.5               |

**Determination of Alkalinity in Water:**

| Indicator       | Init Reading (mL) | Final Reading (mL) |
| --------------- | ----------------- | ------------------ |
| Phenolphthalein | -                 | -                  |
| Methyl Orange   | 38.2              | 49.9               |

**Determination of Total Iron in Water:**

| Read No. | Concentration (mg/L Fe) |
| -------- | ----------------------- |
| 1        | 0.25                    |
| 2        | 0.26                    |
| 3        | 0.27                    |

**Chemical Coagulation (Alum Coagulation):**

| Sample No. | Alum Dose (mg/L | pH   | Turbidty (NTU) | Color (PtCo) |
| ---------- | --------------- | ---- | -------------- | ------------ |
| 1          | 24              | 5.99 | 1.45           | 15           |
| 2          | 48              | 5.88 | 1.12           | 8            |
| 3          | 72              | 5.7  | 1.09           | 6            |
| 4          | 120             | 5.47 | 1.34           | 11           |
| 5          | 168             | 5.61 | 1.41           | 13           |
| 6          | 240             | 5.45 | 1.62           | 17           |

**Determination of COD:**

| Concentration (mg/L) |
| -------------------- |
| 58                   |

**Determination of Arsenic in Water:**

| Concentration (microgram/L) |
| --------------------------- |
| 32                          |

**Total Coliform and Fecal Coliform:**

| TC     | FC  |
| ------ | --- |
| 40 x 4 | 32  |