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Technical Exhibit 2B
Sample preservation and holding times
| Parameter |
| Unit |
| Container |
| Preservative |
| Holding |
time Accreditation
| Number of Container(s) |
| GROUP |
| n-Hexane extract, mineral oil |
| mg/L |
| PE/Glass |
| 1L |
| HCl, pH <2 |
| 28 days |
| WQMA |
| ─ |
| x 2 |
| 3 |
| A |
| n-Hexane extract, animal/vegetable oil |
| mg/L |
| PE/Glass |
| 1L |
| HCl, pH <2 |
| 28 days |
| WQMA |
| ─ |
| x 2 |
| 3 |
| B |
| Phenol |
| mg/L |
| Glass |
| 1L |
| Copper sulfate, |
Phosphoric acid
| 28 days |
| WQMA |
| pH<2, 4℃ |
| x 2 |
| 3 |
| C |
| Cyanide |
| mg/L |
| PE/Glass |
| 1L |
| NaOH, |
12 pellets
| 14 days |
| WQMA |
| pH>12, 4℃ |
| x 1 |
| 2 |
| D |
| Metals, Recoverable |
| Chromium |
| mg/L |
| PE |
| 125mL |
| HNO3, pH <2 |
| 180 days |
| NELAP |
WQMA
Zinc
Copper
Cadmium
Arsenic
Lead
Mercury
| Metals, Dissolved |
| Soluble iron |
| mg/L |
| PE |
| 125mL |
| pH <2 |
| 180 days |
| NELAP |
WQMA
MUST filter (0.45㎛) after collecting
Soluble manganese
| Organic phosphorous |
| mg/L |
| Amber Glass |
| 1 L |
| pH5~8, with NaOH, H2SO4 |
| ext 7 days |
anl14days
| Hexavalent Chromium |
| mg/L |
| PE |
| 1L |
| None |
| 24 hours |
| WQMA |
| 4℃ |
| x 1 |
| 2 |
H
| Total suspended solids |
| mg/L |
| PE/Glass |
| PCB |
| mg/L |
| Amber Glass |
| 1L |
| None |
| ext 7 days |
anl14days
| Coliform bacteria |
| numbers |
/mL
| sterilized PE |
| 1L |
| None |
| 24hr |
| WQMA |
| <4℃ |
| x 1 |
| 2 |
| J |
| Total nitrogen |
| mg/L |
| PE/Glass |
| 1L |
| H2SO4 |
| 28 days |
| WQMA |
| pH<2, 4℃ |
| X 2 |
| 3 |
| K |
WQMA
| Parameter |
| Unit |
| Container |
| Preservative |
| Holding |
time Accreditation
| Number of Container(s) |
| GROUP |
| VOCs |
| Trichloroethylene |
| mg/L |
| Amber Glass |
| 40 mL |
| HCl, pH <2 |
| 14 days |
| WQMA |
| 4℃ |
| x 2 |
L L
| Alkyl benzene sulfonate (ABS) |
| mg/L |
| PE/Glass |
| 500mL |
| None |
| 48 hr |
| WQMA |
| 4℃ |
| x 2 |
| 3 |
| M |
| pH |
| pH Unit |
| NA |
| NA |
| None |
| ASAP |
| WQMA |
| 4℃ |
| NA |
| NA |
| N |
Glass
| 1L |
| None |
| 90 days |
| NELAP |
| 4℃ |
| X2 |
| 3 |
| Duplicate |
| mg/L |
| NA |
| NA |
| None |
| ASAP |
| WQMA |
| 4℃ |
| NA |
| NA |
| O |
| BLANK |
| ℃ |
| PE/Glass |
| 1L |
| None |
| 48 hr |
| WQMA |
| 4℃ |
| x 1 |
| 2 |
| P |
NOTES:
1. WQMA: Water Quality Measurement Agent, registered in GyeongGi-Do
2. NELAP : National Environmental Laboratory Accreditation Program
3. KSTM: Korea Standard Test Method
4. pH and temperature will be measured on site.
