Abstract
Adsorption, sample preservation, and cross‐contamination are the major impediments to the accurate and sensitive analysis of low‐level mercury samples. Common measures to deal with this issue are to use Teflon, quartz, or borosilicate glass bottles for sampling, standard solution and sample preservation with oxidative chemicals, to prepare standard solutions daily and to use dedicated glassware. This paper demonstrates that these measures are neither efficient nor effective. Two common laboratory sample containers (borosilicate volumetric glass flasks and polypropylene tubes) are investigated for the preparation and preservation of water samples and standard solutions of 0.2–1 µg L−1 with 2% HNO3. Mercury adsorption rates of 6–22% are observed within 30 min and after 48 days, the adsorption is greater than 98%. In stark contrast, no adsorption is found during a testing period of 560 days when the solutions are subject to potassium permanganate‐persulfate digestion. New glass flasks and polypropylene bottles are free of mercury contamination but reused flasks are a major source of mercury cross‐contamination. To minimize adsorption and cross‐contamination, standard solutions are treated by potassium permanganate‐persulfate or BrCl digestion, and each individual sample and standard solution should be stored and prepared in single‐use polypropylene bottle, without transference.
Highlights
Adsorption, sample preservation, and cross-contamination are the major in particular to young children, has been clearly established.[1]
Www.global-challenges.com from preparation.[7a] we observed 6–22% losses of mercury from standard solutions of 0.2–1 μg L−1 in 2% HNO3 from 50 mL volumetric glass flasks within 30 min from preparation
No significant differences were observed in the stability of standard mercury solutions (0.2–1 μg L−1 in 2% HNO3) stored in glass flasks and PP tubes while the adsorption rates observed here were similar to the results reported in the literature (Table 1)
Summary
Adsorption, sample preservation, and cross-contamination are the major in particular to young children, has been clearly established.[1]. Two common laboratory sample containers mercury emissions of 2000 metric tons per year.[2] Bioaccumulation of mercury in fish is well recognized and hazards associated with eating fish have become public health concerns.[3] A typical example of the (borosilicate volumetric glass flasks and polypropylene tubes) are investigated impact of mercury pollution on humans for the preparation and preservation of water samples and standard solutions of 0.2–1 μg L−1 with 2% HNO3. To minimize adsorption and cross-contamination, standard solutions are treated by potassium permanganate-persulfate or BrCl digestion, and each individual sample and standard solution should be stored and full understanding of mercury toxicity and damage to the environment and living organisms is dependent on the accurate and sensitive analysis of mercury and its speciation.[5]. Wan School of Chemistry Beijing University of Chemical Technology Beijing 100029, China
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