Pollution characteristics，source analysis，and health risk assessment of metal elements in ambient PM2.5 in Chengdu City

Abstract

Abstract:

Objective In order to achieve precise environmental prevention and control and protect human health，the pollution characteristics，source analysis and health risks of heavy metals in particulate matter（PM_2.5） in Chengdu City were evaluated. Methods The 54 and 50 effective atmospheric PM_2.5 samples were collected in December 2023 and April 2024 in Chenghua District of Chengdu City. The concentrations of 14 heavy metal elements（Al，As，Cd，Fe，Pb，etc） in PM_2.5 were determined by Wavelength dispersive X-ray fluorescence（WDXRF）. The sources of heavy metals were analyzed by enrichment factor method and positive matrix factorization（PMF），and the health risk of heavy metal was evaluated by risk assessment model. Results The total concentration of heavy metals in spring（10 843.8 ng/m³） was 1.5 times that of winter（6 896.6 ng/m³）. Out of the measured heavy metal elements in PM_2.5，Al，Mg，Fe，K and Zn exhibited the highest concentrations，collectively accounting for 67% in winter and 84% in spring. The enrichment factor（EF） of Cd was 1 113.4，which was heavily enriched. PMF source analysis showed that heavy metal elements in PM_2.5 in winter and spring were mainly derived from traffic source，crustal sources，combustion source and industrial source. Health risk assessment analysis showed that the risk of carcinogenicity was significant，and the risk of non-carcinogenicity was low. The total carcinogenic risk and total non-carcinogenic risk of adults were 2.1 times that of children. The carcinogenic risk of As to adults was >10^-4，indicating a carcinogenic risk，while the non-carcinogenic risk of As was also relatively high. Conclusion The Cd has the highest enrichment factor，and the carcinogenic risk and non-carcinogenic risk of As are higher，and certain measures should be taken to supervise the emission reduction of these two elements，such as metal smelting，alloy anti-corrosion industry，and coal combustion.

Key words: Particulate matter, Heavy metals, Enrichment factor, Positive matrix factorization, Health risk

CLC Number:

X513

HU Yan, ZHAO Kui. Pollution characteristics，source analysis，and health risk assessment of metal elements in ambient PM_2.5 in Chengdu City. [J]OCCUPATION AND HEALTH, 2026, 42(11): 1539-1543.

Figures/Tables 4

References 22

[1]	LIU Y, HU J, WANG X R, et al. Distribution,bio-accessibility,and health risk assessment of heavy metal in PM_2.5 and PM₁₀ during winter heating periods in five types of cities in northeast China[J]. Ecotoxicol Environ Saf, 2021, 214:112071.
[2]	王显钦, 费学海, 杨员, 等. 贵阳市花溪城区PM_2.5中重金属元素的污染特征、来源及健康风险评价[J]. 环境科学学报, 2023, 43(6):110-118.
[3]	方波, 曾豪, 张磊, 等. 曹妃甸采暖期和非采暖期PM_2.5中不同重金属元素污染特征及健康风险评价[J]. 环境科学研究, 2020, 33(12):2785-2793.
[4]	魏青, 陈文怡, 金麟先. 枣庄市大气PM_2.5重金属元素健康风险评价及污染来源解析[J]. 中国粉体技术, 2020, 26(6):69-78.
[5]	曲光辉, 孙俊苹, 王申博, 等. 郑州市大气PM_2.5中重金属元素污染特征、来源及健康风险评估,基于高分辨数据[J]. 环境科学, 2022, 43(4):1706-1715.
[6]	彭晓, 杨萌, 王笑欢, 等. 大连市大气PM_2.5中重金属元素污染特征、来源及健康风险评估[J]. 生态毒理学报, 2024, 19(4):294-310.
[7]	王凯, 王瑛. 兰州市PM_2.5中重金属元素的来源及健康风险评价[J]. 环境科学与技术, 2024, 47(7):216-224.
[8]	肖思晗, 蔡美君, 李香, 等. 厦门港大气PM_2.5中重金属污染特征及健康风险评价[J]. 环境科学, 2022, 43(7):3404-3415.
[9]	姚森, 王乾恒, 薛妍, 等. 郑州市冬季大气PM_2.5金属元素来源及健康风险评价[J]. 环境科学, 2022, 43(5):2329-2335.
[10]	陶杰, 闫慧姣, 徐艺斐, 等. 郑州市冬春季PM_2.5中金属元素污染特征、来源及健康评估[J]. 环境科学, 2023, 40(12):5224-5233.
[11]	潘成珂, 黄韬, 高宏, 等. 张掖市城区大气细颗粒物PM_2.5的化学组成及来源解析[J]. 环境科学, 2022, 43(12):5367-5375.
[12]	TANG Y, LI Y, ZHOU H, et al. Source apportionment and elemental composition of PM_2.5 in Chengdu,China[J]. Nat Environ Pollut Technol, 2019, 18(1):329-334.
[13]	杨婧, 郭晓爽, 藤曼, 等. 我国大气细颗粒物中金属污染特征及来源解析研究进展[J]. 环境化学, 2014, 33(9):1514-1521.
[14]	DUAN F K, LIU X D, YU T, et al. Identification and estimate of biomass burning contribution to the urban aerosol organic carbon concentrations in Beijing[J]. Atmos Res, 2009, 38(9):104-107.
[15]	LIN Y C, ZHANG Y L, SONG W H, et al. Specific sources of health risks caused by size-resolved PM-bound metals in a typical coal-burning city of Northern China during the winter haze event[J]. Sci Total Environ, 2020, 734:138651.
[16]	FABREYTTI J F, SAURET N, GAL J F, et al. Elemental characterization and source identification of PM_2.5 using positive matrix factorization:The malraux road tunnel,nice,france[J]. Atmos Res, 2009, 94(2):302-329.
[17]	陈江, 费勇, 马鑫雨, 等, 燃煤与垃圾焚烧飞灰中细颗粒物PM_2.5的重金属元素风险评价[J]. 中国粉体技术, 2016, 22(2):104-107.
[18]	肖凯, 任学昌, 陈仁华, 等. 典型西北钢铁城市冬季大气颗粒物重金属来源解析及健康风险评价——以嘉峪关为例[J]. 环境化学, 2022, 41(5):1649-1660.
[19]	CHEN Y, XIE S D, LUO B, et al. Particulate pollution in urban Chongqing of southwest China:Historical trends of variation,chemical characteristics and source apportionment[J]. Sci Total Environ, 2017, 584-585:523-534.
[20]	周安琪, 刘建伟, 周旭, 等. 北京大气PM_2.5载带金属浓度、来源及健康风险的城郊差异[J]. 环境科学, 2021, 42(6):2595-2603.
[21]	杨安, 王艺涵, 胡健, 等. 青藏高原表土重金属污染评价与来源解析[J]. 环境科学, 2020, 41(2):886-894.
[22]	乔宝文, 刘子锐, 胡波, 等. 北京冬季PM_2.5中金属元素浓度特征和来源分析[J]. 环境科学, 2017, 38(3):876-883.

参数	物理意义	单位	取值
参数	物理意义	单位	成人	儿童
IR	呼吸速率	m³/d	15.0	8.6
BW	体质量	kg	61.9	15.0
EF	暴露频率	d/年	350	350
ED	暴露年限	年	30	6
AT（致恶性肿瘤）	平均暴露时间	d	70×365	70×365
AT（非致恶性肿瘤）	平均暴露时间	d	30×365	30×365

参数	物理意义	单位	取值
参数	物理意义	单位	成人	儿童
IR	呼吸速率	m³/d	15.0	8.6
BW	体质量	kg	61.9	15.0
EF	暴露频率	d/年	350	350
ED	暴露年限	年	30	6
AT（致恶性肿瘤）	平均暴露时间	d	70×365	70×365
AT（非致恶性肿瘤）	平均暴露时间	d	30×365	30×365

元素	冬季		春季
元素	浓度均值（ng/m³）	EF	浓度均值（ng/m³）	EF
Al	1 150.2	1.0	3 709.4	1.0
As	100.0	5.2	74.4	1.2
Ca	346.3	1.7	397.3	0.6
Cd	161.6	1 113.4	117.9	251.9
Co	247.9	7.7	204.7	2.0
Cu	457.4	8.0	215.0	1.2
Fe	1 053.6	1.7	1 035.0	0.5
K	886.5	2.4	1 442.7	1.2
Mg	1 101.6	7.1	2 280.7	4.5
Ni	235.1	3.9	184.5	1.0
Pb	249.5	4.4	245.0	1.3
Sb	345.5	146.9	254.4	33.5
V	98.3	0.6	81.6	0.1
Zn	463.1	2.9	601.1	1.2
合计	6 896.6		10 843.8

元素	冬季		春季
元素	浓度均值（ng/m³）	EF	浓度均值（ng/m³）	EF
Al	1 150.2	1.0	3 709.4	1.0
As	100.0	5.2	74.4	1.2
Ca	346.3	1.7	397.3	0.6
Cd	161.6	1 113.4	117.9	251.9
Co	247.9	7.7	204.7	2.0
Cu	457.4	8.0	215.0	1.2
Fe	1 053.6	1.7	1 035.0	0.5
K	886.5	2.4	1 442.7	1.2
Mg	1 101.6	7.1	2 280.7	4.5
Ni	235.1	3.9	184.5	1.0
Pb	249.5	4.4	245.0	1.3
Sb	345.5	146.9	254.4	33.5
V	98.3	0.6	81.6	0.1
Zn	463.1	2.9	601.1	1.2
合计	6 896.6		10 843.8

元素	致癌风险			非致癌风险
元素	儿童	成人	总和	儿童	成人	总和
As	6.47×10^-5	1.37×10^-4	2.01×10^-4	3.33×10^-2	7.04×10^-2	1.04×10^-1
Cd	4.33×10^-5	9.14×10^-5	1.35×10^-4	1.60×10^-2	3.39×10^-2	4.99×10^-2
Cu	—	—	—	9.64×10^-4	2.04×10^-3	3.00×10^-3
Ni	8.66×10^-6	1.83×10^-5	2.70×10^-5	1.20×10^-3	2.54×10^-3	3.74×10^-3
Pb	—	—	—	8.10×10^-3	1.71×10^-2	2.52×10^-2
V	—	—	—	1.47×10^-3	3.11×10^-3	4.59×10^-3
Zn	—	—	—	2.03×10^-4	4.30×10^-4	6.33×10^-4
总和	1.17×10^-4	2.46×10^-4	3.63×10^-4	6.13×10^-2	1.30×10^-1	1.91×10^-1