Philosophiae Doctor (PhD) Thesis 2019:17
Persistent Organic Pollutants (POPs) and heavy metals in fish from Tanzania – levels and associated health risks to humans and fish
Persistente organiske forbindelser og tungmetaller i fisk fra Tanzania – nivåer og relatert helse risiko for mennesker og fisk
Norwegian University of Life Sciences Faculty of Veterinary Medicine
Department of Food Safety and Infection Biology
Persistent Organic Pollutants (POPs) and heavy metals in fish from Tanzania ± levels and
associated health risks to humans and fish
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ȋʹͲͳͻȌ
ʹͲͳͻǣͳ
ͳͺͻͶǦͶͲʹ ͻͺǦͺʹǦͷͷǦͳͷͺͳǦʹ
TABLE OF CONTENTS
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ǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤ
ǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤ
ȋȌǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤ
ǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤ
ͳǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤͳ
1.1 Persistent Organic Pollutants (POPs) ... 1
1.2 Heavy metals ... 2
1.3 Pollution in Aquatic Environment ... 3
1.4 Human exposure to POPs and heavy metals ... 4
1.4.1 POPs ... 4
1.4.2 Heavy metals ... 4
1.5 Health effects of POPs and heavy metals ... 5
1.5.1 Human health ... 5
1.5.1.1 POPs ... 5
1.5.1.2 Heavy metals ... 6
1.5.2 Fish health ... 6
1.5.2.1 POPs ... 6
1.5.2.2 Heavy metals ... 7
1.6 Assessment of human health risks related to POPs and heavy metals ... 8
1.6.1 Estimated Daily Intake (EDI) ... 8
1.6.2 Target Hazard Quotient (THQ) ... 9
1.6.3 Carcinogenic risk (CR) ... 9
1.6.4 Toxic Equivalent Factor (TEF) and Toxic Equivalent (TEQ)... 10
1.7 Fish health risk: EQS ... 10
1.8 Food safety and food security ... 11
1.9 Aquaculture in Tanzania... 11
1.10 Possible sources of POPs and heavy metals in Tanzania ... 12
ʹǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤͳͶ ͵ǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤͳͷ 3.1 Study locations and sampling sites ... 15
3.2 Species description ... 18
3.3 Sample Collection ... 20
3.4 Sample analysis ... 21
3.5 Ethical requirements ... 23
3.6 Statistical analysis ... 23
Ͷ ǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤʹͶ ... 24
... 25
... 26
ͷǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤʹ 5.1 Methodological consideration ... 27
5.1.1 Choice of samples and sampling locations ... 27
5.1.2 Choice of fish species ... 27
5.2 Analytical methods ... 27
5.2.1 Extraction and detection of analytes ... 27
5.2.1.1 POPs ... 27
5.2.2.2 Heavy metals ... 28
5.3 Ethical consideration ... 28
5.4 Levels and distribution of POPs and heavy metals farmed and wild fish ... 29
5.5 Pattern and varying levels of POPs and heavy metals imported fish ... 30
5.6 Health risk related to levels of POPs and heavy metals ... 31
5.6.1 Comparison to maximum residue limits (MRLs) and maximum limits (MLs) ... 31
5.6.2 Dietary intake of POPs and heavy metals ... 32
5.6.3 Possible health risk of POPs and heavy metals to fish ... 33
5.7 Strength and limitations of the study ... 34
ǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤ͵
ǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤ͵ͻ ͺ ǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤǤͶͳ
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ACKNOWLEDGEMENTS
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ABBREVIATIONS
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SUMMARY
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SAMMENDRAG (SUMMARY IN NORWEGIAN)
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LIST OF PAPERS
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ǣ Paper I
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ǡ ǡòǡ ǡǡǤ
ʹͲͳͺǢͳͻͳǣͶ͵ͺǦͶͶͻǤǣͳͲǤͳͲͳȀǤ ǤʹͲͳǤͲͻǤͳʹͳ
Paper II
ȋChanos chanosȌȋMugil cephalousȌ
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ǡǡ ǡǡǡòǡ ǡ
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ǡͳʹͲͳͺǤ
Paper III
ȋȌ
ȋOreochromis niloticusȌǤ
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ǡòǡ ǡ ǡǡǡ ǡǤ
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1. INTRODUCTION
1.1 Persistent Organic Pollutants (POPs)
ȋȌ ȋǦȌ
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ǦǤ ǡ
ǡ ȋ
ǤǡʹͲͲǢǤǡʹͲͲͺȌǤǦ
Ǧ ȋȌȋǤǡʹͲͳǢǡʹͲͲ͵Ȍ
ȀǤ
Dz dz
Ǥ
ǡ
ǡ ȋ
ǡͳͻͻͷǢ ǡͳͻͻ͵ȌǤ
ȋǤǡʹͲͳǢǤǡʹͲͲǢǡʹͲͳͲȌǤǡ
ǡǤ
ͳͻͲͲ
ǡǡǡǡǡ
Ǥǡǡ
Ǧ ǡ
ǡ ȋǡ ʹͲͲ͵ȌǤ
ǡ ǡ
ǡ ǡ
Ǥ ʹͲͲͳ
ʹͲͲͶ ͳʹ Ǥ
ȋȌǤǡʹͲ
ǡ ȋ ǡʹͲͳͺȌ
ȋͳȌǡͳͷʹ Ǥǡ
ȋͳͻͻʹȌ
ǡȋͳͻͻͺȌ
ǡ
Ǥ
ȋ ǡʹͲͳͺȌǤ
Table 1: List of POPs included in the Stockholm Convention.
Initial 12 POPs (2004)
POPs included in 2009
POPs included in 2011- 2018
Under consideration
Aldrin1 α-HCH1 Endosulfan1 Dicofol1
Chlordane1 β-HCH1 HBCDD2 PFOA and related compounds2
Dieldrin1 Lindane (γ-HCH)1 HCBD2,3 PFHxS and related compounds2 Endrin1 Chlordecone1 PCP1
Heptachlor1 HBB2 PCN2,3
HCB1,2,3 PeCB1,2,3 Deca-PBDE2*
Mirex1 Penta-PBDE2 Hexa- and Hepta-PBDE2
Toxaphene1 PFOS1,2 SCCP2
DDT1 Tetra-PBDE2
PCB2,3 PCDD3 PCDF3
ͳ Ǣʹ Ǣ͵Ǧ Ǥ Ǥȗ Ǧ ǦǦǤ
ȋȌǡ
ȋȌǡ ȋ Ȍ
ȋ ȌǤ
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1.2 Heavy metals
ǡ ǡ
Ǥ
ǯ ȋ
ǤǡʹͲͳͶǢǤǡʹͲͳǢǤǡʹͲͳʹȌǤ
ǡ ǡ
ǡ ȋǤǡʹͲͳʹȌǤ
ǡ
ȋǡʹͲͳͷǢ
ǤǡʹͲͳʹȌǤ ǦǤ
ȋ Ȍǡ ȋȌǡ ȋȌǡ ȋȌǡ ȋȌǡ ȋȌǡ ȋȌǡ
ȋȌ ȋȌǤ Ǧ
ȋȌǡ
ȋȌǡ ȋȌǡ ȋȌȋȌǤ
Ǥ
ͳǤ
ǡ ȋ
ȋȌǦ
ȋȌȌǤ ȋȌǡȋȌ
ȋȌȋǡͳͻͻȌǤ
1.3 Pollution in Aquatic Environment
Ǥ ǡ
ǡ ǡ
ȋ ǡʹͲͳͲǢǤǡ ʹͲͲͻǡ ͳͻͻͺȌǤ
ǡǡ
ǡ ȋǡ ʹͲͲʹȌǤ
ȋȌ
ǡ ǡ Ǥ
1.4 Human exposure to POPs and heavy metals 1.4.1 POPs
Ǥ
ǡȋ
ǤǡʹͲͲǢǤǡͳͻͻǢǤǡʹͲͳͲǢǤǡʹͲͳͲǢǤǡʹͲͲȌ
ǡ
Ǥ ǡ
ȋ Ǥǡ ʹͲͳǡ ʹͲͳͷǢ Ǥǡ ʹͲͳͳǢ Ǥǡ ʹͲͲȌǤ
ȋǦǤǡͳͻͻͶǢòǤǡʹͲͳǢ
ǤǡʹͲͲͻȌǤǡ ǡ
ȋǤǡʹͲͲǢǡʹͲͲͺȌǤ
1.4.2 Heavy metals
εͻͲΨ
ȋǤǡʹͲͳʹǢǤǡʹͲͲȌǤ
ǡǡǡǡǡ
ȋ Ǥǡ ʹͲͲȌǤ
Ǥ ǡ ͶͺΨ
ͶʹΨ ͷͶΨ͵ͲΨǤ ǡ ͷΨȋǤǡʹͲͲȌǤ
Ǥǡ
ȋǡʹͲͲͺȌǤȀǡ
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ȋǤǡʹͲͳͷǢǤǡ ʹͲͲͻǢǤǡʹͲͳͺǢǤǡʹͲͲȌǤǡ
ȋǤǡʹͲͳͷǢǡʹͲͳͷȌǤ
ͳͻͻͲȋǡʹͲͲʹȌǡ
ǡȋǤǡ ʹͲͳǢ ǡ ʹͲͳͺȌǤ
ȋǡʹͲͳͷȌǤ
1.5 Health effects of POPs and heavy metals 1.5.1 Human health
1.5.1.1 POPs
ȋǤǡʹͲͳͷǢ ǤǡͳͻͻǢǡʹͲͳͲȌǤ
ȋǤǡʹͲͳͷǢ
ǤǡʹͲͳͻǢǤǡʹͲͳͺȌǡ ȋ
ǤǡʹͲͲͻǢǤǡʹͲͲͺȌǤ
ǡ ǡ
ǡ ǡ ȋ ǤǡʹͲͳǢ
ǤǡʹͲͲͻǢǤǡʹͲͳͷǢǡʹͲͳͲǢǤǡʹͲͳͷǡʹͲͳͶȌǤǡ
ǡ ǡ ǡ
ǡ ǡ ȋǡ ʹͲͲͻǢ Ǥǡ ʹͲͳͷǢ
ǤǡʹͲͳͺǢǤǡʹͲͳͷȌǤǡ
ǤǦ
ǡǡ ǡ
ǡǡ ȋǤǡ ʹͲͳǡʹͲͳͷȌǤǡ ȋ
ǤǡʹͲͳȌǤǡ
1.5.1.2 Heavy metals
Ǥ Ǧǡǡ
ȋǡʹͲͲȌǤ
ȋ Ǥǡ ʹͲͳͶǢ ǡ ʹͲͲȌǤ
ǡ
ǡȋǡʹͲͲǢ Ǥǡ ʹͲͳǢǡʹͲͳͷǢǡʹͲͲȌǤ
ǡ ȋǡʹͲͲǡʹͲͲͷǢ¡ǡʹͲͲ͵ǢǤǡʹͲͳʹǢ ǡʹͲͲǡʹͲͲͳȌǤ ȋǡͳͻͻȌǤ
ǡ
ǡ Ǣ ǡ ǡ ǡ ǡ ǡȋǡʹͲͳͳǢǤǡ ʹͲͳͶǢǡʹͲͳͷǢǤǡʹͲͳͲǢǡʹͲͳȌǤ
1.5.2 Fish health 1.5.2.1 POPs
Ǥ
ȋ Ȍ ǡ
ȋǡ ʹͲͳͷȌǤ ǡ
ȋǡ ʹͲͳͷǢ Ǥǡ ʹͲͲ͵ȌǤ
Ǥ
ȋǤǡʹͲͳǢǤǡʹͲͳǢǤǡʹͲͲʹȌǤǦ
ǡȋʹͲͲȌ Ǣ
ǤǤǡȋʹͲͳȌ
ǡ Ǥ
ǤǡȋʹͲͳͺȌ
ǡ Ǧ ȋȌ ȋǡ ͶͷͲ ȌǤ
ǡ ǡ
ȋǦ Ǥǡ ʹͲͳʹȌǤ ǡ
ǡ ǡ
ȋǦǤǡʹͲͳʹȌǤ
1.5.2.2 Heavy metals
ǡ
ȋ Ǥǡ ʹͲͳʹȌǤ Ǧ
ǡǡǤ
ȋǤǡͳͻͺͷǢïǤǡʹͲͲȌǤ ǡ
ǡ
Ǧ ȋǡʹͲͳͷǢǤǡʹͲͳȌǡ
ȋǤǡʹͲͳʹȌǤǦ
ǤǡȋʹͲͳȌ
ǡȋʹͲͳͷȌ Ǥ
ǤǡȋʹͲͳȌ
ǤǡȋʹͲͳͷȌ Ǥ
ǤǡȋʹͲͳͲȌ Ǥ
ǡ
ǡ ǡ
ǡ ǡ
ȋ Ȍǡ ǡ ȋǡʹͲͳͷǢ
ǡʹͲͳͶȌǤ ǡ ǡ
ǡ ǡ
ȋǡʹͲͳͷǢǡʹͲͳȌǤ
1.6 Assessment of human health risks related to POPs and heavy metals
ǡȋǡʹͲͳȌǤ ǡ ǡ
ǡ Ǥ
ǡ ǡ
ǡ
Ǥ ǡ
ȋȌǡȋȌǤ
ǤǡǡȋʹͲͲͲȌ
Ǥ
1.6.1 Estimated Daily Intake (EDI)
Ǥ
ȋȌǡ
Ǥ
ܧܦܫ ൌܯܥ כ ܫܴ݀
ܤܹ
ǡ ȋȀȌǡ
ȋʹͶǤȀȌȋ ǤǡʹͲͳȌ
ȋͲȌǤ ǡȋʹͲͳͺȌ͵ͺǤ͵Ȁ
Ǥ
1.6.2 Target Hazard Quotient (THQ)
ǡǤǤ
ȋȌ ǡ ǡ
ǤǤ ȋȌ ȋȌǤ
ܶܪܳ ൌܧிכ ܧכ ܨூோכ ܥ
ܴכ ܹכ ܶ כ ͳͲିଷ
ȋ͵ͷ ȀǤȌǢ
ȋͳǤͺȌ Ǣ ȋȀȌǢ
ȋȀ ȌǢ
ȋȀȀȌǢ ȋͲ Ȍ
Ǧ ȋȗȌ Ǥ
ܪܫ ൌ ܶܪܳ
ୀଵ
Ǥ
ͳǤ ͳ
Ǥͳǡ
Ǥ
1.6.3 Carcinogenic risk (CR)
ȋǡ ͳͻͺͻȌǤ ǡ ȋʹͲͲͷȌǡ ȋͳͳͲΫ ͳͳͲΫͶȌǤ
ǡ Ǥ
ǡ ȋǡʹͲͳͲȌǤ ǡȋʹͲͲͷȌ ȋ ȌͳǤͷȀ
Ǥ
ܥܴ ൌܧிכ ܧכ ܨூோכ ܥ כ ܥܵܨ
ܹכ ܶ כ ͳͲିଷ
1.6.4 Toxic Equivalent Factor (TEF) and Toxic Equivalent (TEQ)
Ǧǡ
ȋ Ȍ Ǧ
ȋǤǡʹͲͲȌǤ ȋȌ
ǦǤǦǤ
Ǣ
ܶܧܳ௧௧ൌ ሺܥכ ܶܧܨሻ
Ǧ ǡ
Ǥ
1.7 Fish health risk: EQS
ȋȌ
ǡȋǡʹͲͲͲȌǤ
ȋ Ȍ ȋ ǡ ʹͲͲͲȀͲȀȌǡ
ȋǡʹͲͲͲȌǤ
ȋȌǤ
Ǥ ȋǡʹͲͳ͵ǡʹͲͲͺȌǤǣ ͳǡͳǡͳǡ ͳǡ ǡǡ ą ȋą
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