Related Experiment Video
Updated: Jan 17, 2026
Clean Sampling and Analysis of River and Estuarine Waters for Trace Metal Studies
Published on: July 1, 2016
Reference Intervals for Lead, Arsenic, Mercury, and Cadmium in the Population of Southwest China: A Comparative Study
Manqing Nie1, Hang Du2, Tiancheng Xie3,4
1West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, People's Republic of China.
Background:
Environmental metal pollution poses a potential threat to public health, and reference intervals (RIs) are crucial tools for assessing exposure levels.
Aims:
Our study was the first to systematically establish RIs for lead, arsenic, mercury, and cadmium in a population in southwest China, examining differences across genders and ages. The study also compared the differences between RIs obtained by two sampling techniques, including direct and indirect sampling, to assess the substitutability and limitations between the two techniques.
Materials And Methods:
Direct sampling employed atomic absorption spectrometry (AAS) and inductively coupled plasma-mass spectrometry (ICP-MS) on human biomonitoring (HBM) data, while indirect sampling utilized a Gaussian Mixture Model (GMM) applied to a local Laboratory Information System (LIS) database. RIs were determined using the nonparametric method for both approaches.
Results:
RIs were established for each metal, with variations observed across age groups for cadmium and lead, and across genders for lead in certain age groups. Most of the RIs established by the direct sampling technique had a narrower range compared to that established by GMM, and the RIs established by the two techniques were partially biased.
Discussion And Conclusion:
These RIs offer a vital baseline for assessing environmental metal exposure and identifying metal poisoning in Southwest China. Additionally, this study highlights the potential of the GMM-based indirect sampling technique as a viable alternative to the traditional direct sampling technique, with the dual-technique comparison enhancing our understanding of their substitutability and limitations, thus opening new avenues for environmental health research.
More Related Videos
09:33An Anaerobic Biosensor Assay for the Detection of Mercury and Cadmium
Published on: December 17, 2018
09:33Visualizing Field Data Collection Procedures of Exposure and Biomarker Assessments for the Household Air Pollution Intervention Network Trial in India
Published on: December 23, 2022
Related Concept Videos
01:23Sampling Plans
Random sampling is a method where each member of the population has an equal chance of being selected for the sample. It involves selecting individuals randomly, often using random number generators or lottery-type methods. For example, when analyzing the properties of a...
01:18Sampling Methods: Sample Types
Solid samples include a variety of substances, such as sediments from water bodies, soil, metals, and biological tissues. Two standard methods for extracting sediments from water bodies are grab sampling and piston coring. Grab sampling involves using a device to collect a discrete sediment sample from the bottom of a water body with minimal disturbance. Grab samples do not always represent the entire area due to...