Sample Preparation Flashcards

1
Q

A complete ______requires severa consideration incuding
1.type of saple to collect
2. Wheter to collect grab samples, composite, or in situ samles
3. Whether the population is homogeneous or heterogeneous
4. Appropriate size for each sample
5. Number of sample to collect

A

Sampling plan

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2
Q

The ____ is reduced to a uniform particle size by passing it through the sieve

A

Gross sample

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3
Q

To ensure homogeneity the material from gross sample is processed so called

A

Coning and quartering

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4
Q

Inorganic solid samples have entrapped water so they must be dried before weighing .
T or F

A

True

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5
Q

In drying the samples prior to weighing, they are placed in a drying oven at ____ °C for 1 to 2 hrs

A

105-110°C

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6
Q

_____ or side reaction of the sample must be considered prior to drying

A

Decomposition

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7
Q

Thermally unstable sample can be dried in a ____

A

Desiccator

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8
Q

This can also be used to remove a fairly large amount of water from a sample that contains thermally labile material

A

Lyophilizer or freeze dryer

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9
Q

The process of incineration or destructing something at high temperature (525°C up) using muffle furnace

A

Dry ashing

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10
Q

Crucibles with maximum tamperature at 500°C

A

Pyrex

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11
Q

This crucible resembles quartz in their properties but then will have a tendency to crack with rapid temperature change

A

Porcelain

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12
Q

This crucible can widstand 1000°C; disposable, unbreakable

A

Quartz fiber

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13
Q

This type of crucible can widstand up to 1250°C and also resistant to halogens, acids but not alkali at high temperature

A

Quartz

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14
Q

This crucible is resistant to both acid and alkalis and are inexpensive but they are composed of Fe, Cr, and Ni which can be a possible cause of contamination

A

Steel

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15
Q

This crucible is very inert and are probably best overall but currently too expensive

A

Platinum

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16
Q

This is commonly used prior to specific mineral analysis

A

Wet digestion or wet ashing

17
Q

Also known as aqua regia which dissolves Au and Pt

A

HCl:HNO3 (3:1)

18
Q

If inorganic sample resist decomposition by digesting with acids or bases they are often brought into solution by fusing with a large excess of an alkali metal salt called

A

Flux

19
Q

This is only the sample preparation technique that allows you to matrix match the standards and known that cover a wide range of materials

A

Fusion

20
Q

This is well suited to prepare samples for ICP and AA analyses since unlike common acid digestion technique it allows complete digestion

A

Fusion