Quiz 5: Standard Operating Procedure

What is the recommended temperature for storing water samples during transportation?

• 20°C

• 4°C

• 10°C

• 2°C

How should fish samples be labeled for trace metal analysis?

• Without any labels

• Only with the species name

• With length, weight, and species

• With collection date only

What is the sample weight range for sediment samples in the Direct Mercury Analyzer DMA-80?

• 1-2 grams

• 0.1-0.5 grams

• 0.5-1 grams

• 0.25-0.75 grams

What is the purpose of using acid-washed equipment to collect field blanks?

• To assess potential contamination

• To increase sample volume

• To speed up the analysis process

• To reduce sample weight

How should fish samples be handled to prevent contamination during collection?

• Use clean, non-contaminating gloves

• Avoid labeling the samples

• Touch the sample areas used for analysis

• Use bare hands

What is the recommended procedure for collecting water samples for trace metal analysis?

• Submerge the bottle below the water surface

• Fill the bottle halfway to leave headspace

• Rinse the bottle with air before collecting

• Use any type of bottle for collection

What is the minimum number of fish samples required for trace metal analysis?

• 20 samples

• 10 samples

• 5 samples

• 15 samples

How should sediment samples be stored during transportation to the laboratory?

• In a warm and humid environment

• At room temperature

• In direct sunlight

• In a cool, dark, and dry environment

What is the sample preparation step for river/sea water and wastewater samples in the Direct Mercury Analyzer DMA-80?

• Dry the sample at 105°C

• Filter the sample using a 0.45µm syringe filter

• Weigh the sample using an analytical balance

• Grind the dried sample to a fine powder

What is the primary purpose of maintaining accurate and detailed records of each sample collected?

• To speed up the transportation process

• To ensure sample integrity and prevent contamination

• To track the temperature of the samples

• To increase the weight of the samples