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第十三章 食品中限量元素的测定 PowerPoint PPT Presentation


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第十三章 食品中限量元素的测定. 必需元素. 非必需元素. 有毒元素. 第一节 概述 食物中各种元素对人体来说,分为:. 人体内矿物质大约占人体重量 6% ,其中包括常量元素、微量元素、有毒元素。 一.常量元素: K 、 Na 、 Ca 、 Mg 、 P…… 二.微量元素: 在肌体中起作用的浓度以 ppm 、 ppb 计。是人体必需的、但过量又会中毒的元素,现有 14 种。 ① Fe 是人体血液形成不可少的,缺铁性贫血就是因缺乏铁,而多了得“血色病”。.

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第十三章 食品中限量元素的测定

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6%

KNaCaMgP

ppmppb14

Fe


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ZnZnZn

2000844 %32.4 %

1+6+3Cr2O3 Cr(OH)3


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2

1HgCdPbAsSnCuCr 70

1460

10 1631


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04


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2

3.

  • ,


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4P 233131

132GB574985


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13


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13

5(1) (2)


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(3) 12minCuPbCdZn


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1.

2.


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1.

+=

+

2.


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  • HOH O OH O OHO

    O N SCl

  • +

    C O + N-OH C N-OH


1 p d k d

1. PDKD

A APDKD

  • PDA = A/A

  • KD = [A]/ [A]


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2.

D = C / C

C

C

3. E

E = / 100%

350


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E= CV/CV+ CV C

=C/CV/ V+ C/ CV

C/ C=D

= D V/V+ D V

= D /V/ V+D

100


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HDZ

NaDDTC

CuP N

2

pH


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3

1

2pHpH

,

Zn2+pH6.510.


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(3)

CCl4CHCl3


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4

pH

.KCN Zn2+Cu2+

Ca2+Mg2+AL3+Fe3+

EDTA Hg2+Au2+


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pH

.+ PbSn2+TiBi

+ PbHgAgCu


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3.

d 5

PbZnCdHg

P335

+ NH2NH2

11H2


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1H

pH

P35712-5


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()1.Pb

4060%


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1m1.5m162000880%

1

pH9Pb2+ CCl4


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11ug/mlHNO3Pb(NO3).

0.001%CCl4

2


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NaOHFeSO4()

CaMg

150mg

1-10% HNO3

2

0.01%


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GB/T 5009.122003

1.

2.

3.

4.

5.


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2

1

1

2Zn

GB 5009.142003

3-5g


Ph 4 5 5 0 ccl 4 ph

pH 4.5-5.0,CCl4pH

  • 520nm

  • 11-2

    2


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3pH

2

213.8 nmZn

99.99%HCl


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3Cd) GB 5009.152003

4-2228.8nmHCL HNO3+H2O


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4-2

pH64-2


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4

40ug/10 ug/

FAO/WHO34 ug/

mg/kg

0.02 0.05

0.3 0.01

0.01 0.05


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11 mg/kg

721

21 mg/kg

590

31

2


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1

220%FeCl2

3+

410%KMnO4


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GB 5009.172003

1.

2.

3.


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SnH4

1

4


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490 nm

3730

1

2

3

4 1ppm.


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GB 5009.162003

1.

2.


Gb 5009 13 2003

GB 5009.132003

  • 2.5 ppm


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GB 5009.1585

6

1.

C6H5NH-NH

C=O

C6H5NH-NH


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KMnO4

1)

2)

3) 63Cr

4)

2.


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1.CuCuCu


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2.


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PEAAS10076


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WFX1F 190860nm


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8410 160820nm0.008nm


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  • X


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4

GB5009.112003

0.7 mg/kg 1 mg/kg

GB5009.1185


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15ASH3AsH3H2SH2S


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2 P38212-3

AsH3

HClKI SnCl2,

Zn

Pb(AC)2

H2S

AgDDC


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1


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  • 2P38212-43AS2O3


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5

(1)H2SH2S

(2)

(3)

AS2O3AsH3HgBr2


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H2SeSe246H2SeO4H2SO4

ADI50200g S


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VA CEK Se

  • >5ppmSe

    0.005 ug

    33

    1ug


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FFFF=3.04.5mgF


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1pH


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1.


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