11 2 3

240 2040 20

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11%~16%:

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P304.10

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60

-

1ml15%2H2SO4

1.pHpH >52.11

11234567

2

1 GB2759 (mg/kgpb)

2 ;

3 GB1079089 QB943

4 GB771887GB/T1343292GB1343292

GB4805

12344~5cm5

1

2

5mL10%NaOH0.1g 30min5mL l%10%NaOH0.1g30min

5mllmL 10%0.1g10ml 1%NHOH ()

1. 2Oml 2. 5mL2 3. 5mL (1+1) 5ml(11)5min2

3http://v.ku6.com/show/HYX0nnxGYnn5VEJa.html

20ml10ml2.5mol/L1ml95%40ml10min

41 2 3 4

5

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2 (1)()()

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3()

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(4)

(5)

42.53150180

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(3)

12