It's a presentation on a thesis work.

1. Presenter
Zubayer Islam
Roll : 108016
Session : 2020- 2021
Assessing the Implications of Heavy Metal Pollution and Microplastic
Contamination from Plastic Recycling Factories on Environment and
Human Exposure in Kamrangichar, Dhaka
Inorganic and Analytical Chemistry
Department of Chemistry
University of Dhaka
Supervisor
Shatabdi Roy
Co-supervisor
Dr. Md Safiqul Islam

2.  Background
 Motivation
 Objectives
 Methodology
 Results and Discussion
 Conclusion
Contents

3. Background

4. Motivation

5. Objectives
 Assess microplastic contamination and characteristics
 Analyze heavy metal pollution
 Investigate the relationship between microplastic and heavy metal
 Evaluate human exposure to microplastics and heavy metals

6. Methodology: Sampling
PM2.5 (n=44), 3 locations
TSP (n=6), 3 locations
Street dust (n=4)
River water (n=5)
Factory- 1
Factory- 2 Outdoor

7. Microplastic analysis
Adding H2O2
60 °C, 5 days
Adding ZnCl2
Ultrasonicate
Settle overnight
Vacuum Filter
Quantification &
visual characterization
Polymer
characterization
Microscopy
ATR-FTIR
𝐸𝑖𝑛ℎ =
𝐶𝑎 × 𝑅𝑖𝑛ℎ
𝐴𝐵𝑊
… … (1)
𝐸𝑖𝑛𝑔 =
𝐶𝑑×𝑅𝑖𝑛𝑔
𝐴𝐵𝑊×1000
… … (2)

8. Heavy metal analysis
HNO3,
H2O2
1: 10
dilution
ICP-MS
Inhalation exposure, Dinh =
𝑈𝑎×𝑅𝑖𝑛ℎ×𝐹𝐸×𝐷𝐸
𝐴𝐵𝑊×𝐴𝑇
… … (3)
Ingestion exposure, Ding =
𝑈𝑑×𝑅𝑖𝑛𝑔×𝐹𝐸×𝐷𝐸
𝐴𝐵𝑊×𝐴𝑇
× 10-6 … … (4)
Dermal exposure, Ddermal =
𝑈𝑑×𝑆𝐴×𝑆𝐿×𝐴𝐵𝑆×𝐹𝐸×𝐷𝐸
𝐴𝐵𝑊×𝐴𝑇
×10-6 … … (5)
Hazard index, 𝐻𝐼 = 𝐻𝑄𝑖 =
𝐷𝑖𝑛𝑔
𝑅𝐷𝑖𝑛𝑔
+
𝐷𝑖𝑛ℎ
𝑅𝐷𝑖𝑛ℎ
+
𝐷𝑑𝑒𝑟𝑚𝑎𝑙
𝑅𝐷𝑑𝑒𝑟𝑚𝑎𝑙
… … (6)
Carcinogenic risk, 𝐿𝐶𝑅 = 𝐷𝑖𝑛ℎ/𝑖𝑛𝑔/𝑑𝑒𝑟𝑚𝑎𝑙 × 𝑆𝐹𝑖𝑛ℎ/𝑖𝑛𝑔/𝑑𝑒𝑟𝑚𝑎𝑙 … … (7)
Geo-accumulation index, 𝐼𝑔𝑒𝑜 = 𝑙𝑜𝑔2
𝐶𝑑
1.5 × 𝐵𝑉
… … (8)
Enrichment factor 𝑬𝑭 =
𝑪𝒅
𝑪𝒓𝒆𝒇
𝒔𝒂𝒎𝒑𝒍𝒆
𝑪𝒅
𝑪𝒓𝒆𝒇
𝒃𝒂𝒄𝒌𝒈𝒓𝒐𝒖𝒏𝒅
… … (9)

9. Result and Discussion
Average in air = 2186 MPs/m3 (Liao et al., (2021) in indoor air Wenzhou, China reported 1583 MPs/m3
Average in dust = 1018 MPs/g (Patchaiyappan et al. (2021) in road dust Chennai, India reported 2.27 MPs/g

10. Microplastics based on apperance

11. Size distribution of microplastic
Smaller particles can easily become airborne due to their light weight

12. Polymeric composition
Textile, fishing
Packaging
Bags
Bottles

13. Polymeric composition
Polymeric composition
Bags, consumer
goods etc.
Electronics, lens Packaging

14. Polymeric composition
Heavy metal in air
(0.072 μg/m3)
(18.90 μg/m3)
(1.083 μg/m3)
(1.947 μg/m3)
(0.996 μg/m3)
No seasonal trend was observed
Pb, Ni, As, and Cd that significantly exceed the guideline values
#Factory-1: As (0.049), Cr (0.571), Cu (0.874)
#Factory-2: Pb (3.63) #Outdoor: Ni (0.476), Hg (0.004)

15. Polymeric composition
Heavy metal in dust
Element D1 (Factory-1) D2 (Factory-2) D3 (Outdoor) D4 (Background)
(Safiur Rahman
et al., 2019)
Zn 9.32E+02 2.67E+03* 2.85E+02 4.39E+02 2.39E+00**
Pb 2.82E+03* 5.35E+02 1.25E+02 1.31E+02 1.89E+01**
Cr 9.32E+01 1.04E+02* 6.75E+01 3.23E+01 1.44E+02
Cu 4.84E+01* 4.03E+01 4.30E+01 2.53E+01 4.97E+01
Ni 2.44E+01 2.68E+01* 2.23E+01 1.10E+01 3.70E+01
As 4.55E+00* 4.02E+00 2.22E+00 1.87E+00 8.09E+00
Cd 8.27E-01* 1.01E+00 6.92E-01 8.07E-01 1.16E+01
Hg 1.43E-01* 1.02E-01 6.67E-01 7.39E-02 -
*Highest
**Lower than this study

16. Polymeric composition
Heavy metal in water
Element
W1
(Factory-1)
W2
(Factory-2)
W3
(Middle)
W4
(Background
1)
W5
(Background
2)
Drinking
water
guidelines
(DPHE;
WHO)
Zn 1.78E+04 9.78E+04 1.14E+05 3.67E+04 5.45E+04 5.00E+00
Pb 3.14E+03 3.25E+03 4.60E+03 2.30E+03 4.07E+03 5.00E-02
Cr 2.15E+03 1.09E+03 1.65E+03 1.12E+03 1.52E+03 5.00E-02
Cu 1.64E+03 1.61E+03 1.61E+03 1.54E+03 1.68E+03 1.00E+00
Ni 9.88E+02 8.52E+02 9.64E+02 6.13E+02 7.12E+02 1.00E-01
As 4.74E+01 3.45E+01 4.46E+01 3.39E+01 2.97E+01 5.00E-02
Cd 4.15E+00 4.44E+00 1.42E+01 2.11E+00 2.18E+01 5.00E-03
Hg 2.96E+00 3.38E+00 1.46E+01 1.68E+00 2.39E+00 1.00E-03

17. Polymeric composition
Heavy metal and Microplastic
Concentration of MPs varies with Pb. Or Pb concentrations vary with MP?
High concentration of Pb found near Plastic recycling factory by Qin et al., (2022) in China

18. Polymeric composition
Factories as active polluter

19. Polymeric composition
Health risk
Einh
(MPs/day/kg-Bw)
Eing
(MPs/day/kg-Bw)
Child 1107.3 13.57
Adult 624.45 1.45
Table: Exposure to microplastics
Table: Hazard Index (HI)
HI
Child
1.99
Adult 1.46
Element
SF ICR
Inhalation Ingestion Dermal Inhalation Ingestion Dermal
As 1.51E+01 1.50E+00 3.66E+00 2.78E-05 2.47E-06 7.22E-07
Cd 6.30E+00 - - 2.82E-06 - -
Cr* 4.20E+01 - - 3.31E-04* - -
Ni 8.40E-01 - - 6.14E-06 - -
Table: Carcinogenic Risk (CR)
EPA permissible limit 1×10-6 to 1×10-4

20. Polymeric composition
Heavy metal Contamination
Element
Cd
(mg/kg)
BV
(mg/kg)
Igeo EF
As 3.118 4.8 -1.21 1.38
Pb 331.128 17 3.70 41.2
Cd 0.817 0.09 2.60 19.2
Cr 41.683 92 -1.72 0.96
Cu 80.363 28 0.94 6.08
Ni 23.352 47 -1.59 1.05
Zn 685.478 67 2.77 21.7
Hg 0.412 0.05 2.46 17.5
Mn 263 557 -1.66 1

21. Polymeric composition
Conclusion
 Elevated microplastics in air and dust
 Size range <20μm was dominant
 PS was most abundant followed by PE
 Heavy metal levels were 6-20 times higher than guideline
 Microplastics show possible correlation with Pb
 pollution in the surface water of Turag River.

22. Thank You