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Neutralizing agents
Methods not shown do not use a neutralizing agent.
Method
Cyanide-2
Buffer solutions
Methods not shown do not use a buffer solution.
Method
Ammonia-1: Phenate
Method/ISE
Ammonia–2:
Nesslerization
Method
Tritium-1
Prepare the buffer solution—Ammonia-1 or -2
1. Put a 1 L container on a top-loading balance.
2. Set the balance to zero.
3. Add 964 g of deionized water.
4. Add and fully dissolve sodium borate (Na
5. Add sodium hydroxide (NaOH). Refer to
6. Mix well.
7. Put the solution in a closed container.
Concentration
0.025 M borate buffer
0.011 M borate buffer
Neutralizing agent
200 μL of concentrated H
Buffer solution
Samples preserved with 2 mL concentrated sulfuric
acid per liter:
1.0 mL of 0.025 M borate buffer (Na
Buffer at pH 9.5 to decrease the hydrolysis of
cyanates and organic nitrogen compounds.
Samples not preserved with acid:
0.75 mL of 0.011 M borate buffer (Na
Buffer at pH 9.5 to decrease the hydrolysis of
cyanates and organic nitrogen compounds.
0.75 mL of 0.011 M borate buffer (Na
Buffer at pH 9.5 to decrease the hydrolysis of
cyanates and organic nitrogen compounds.
1 or 2 drops of 10 M NaOH
Table 3 Borate buffer information
Sodium borate
5 g (anhydrous)
9.5 g (decahydrate, 10 H
2.17 g (anhydrous)
4.2 g (decahydrate, 10 H
SO
2
4
B
O
).
2
4
7
B
O
)
2
4
7
B
O
)
2
4
7
B
O
). Refer to
Table 3
2
4
7
Table 3
for quantity.
O)
2
O)
2
Preparation
Refer to
Prepare the buffer
solution—Ammonia-1 or -2
on page 19.
—
for quantity.
Sodium hydroxide
22 g (solid)
22 g (solid)
36 mL of 0.1 M solution
36 mL of 0.1 M solution
English 19
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