Methodology analysis. ? 3. Split the sample using

Methodology

 

Appendix: Particle Size Analysis

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Wet Sieving Procedure

Equipment needed: Metal tray, riffle box, oven set to 100o
C, weight balance, bucket, stirrer, 50g/l sodium hexametaphosphate, stainless
steel sieves, O-rings, sieve shaking apparatus.

1.    
A sample of >400g is needed for wet sieving -depending
upon the maximum clast size. ?

2.    
Samples need to be dried in the oven (at least 70o C) before
analysis. ?

3.    
Split the sample using the riffle box in order to extract a
subsample for the laser granulometer. The sample may need to be split a number
of times in order to extract a c.5g subsample. ?

4.    
Once the subsample is extracted, amalgamate the remaining
sample. ?

5.    
Weigh the dried sample to 2 decimal places using the coarse
balance 1. ?

6.    
Add the sample to a clean bucket and cover with water from
the tap. ?

7.    
Add 100ml 50g/l Sodium hexametaphosphate solution (breaks
the sediment down). ?

8.    
Stir the sample for a few minutes. ?

9.    
Select sieves ranging from 16mm (-4ø) mesh diameter to 250?m
(2ø)                    mesh diameter. Around 8 to 9 sieves are
sufficient. ?

10.  Stack the
sieves in order from highest mesh diameter to lowest (250?m or 2ø should be at
the bottom of the stack). Place a rubber O-ring between each sieve. ?

11.  Place the
base pan on the sieve shaker with the outlet/tube facing into the sink. ?

12.  Place the
sieve stack onto the base pan. Ensure there is an O-ring between the final sieve
and the base pan and that the sieve stack is attached securely. ?

13.  Carefully
pour the sample from the bucket into the top of the sieve stack. Ensure that
the portion

?

18.  Remove the
lid, remove each sieve and place into the oven at c.80o C. Check each sieve is
clean before removing from the sieve stack and ensure that the O-ring is
removed before the sieve is placed in the oven. ?

19.  Dry the
sieves containing sediment at 80o C overnight. ?

20.  Once dry
weigh the portion of the sediment that is retained on each sieve. ?

 

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