scholarly journals Toxicity of Zinc Dissolved In Saigon River to the Tropical Micro-Crustacean Daphnia Lumholtzi

2016 ◽  
Vol 5 (2) ◽  
pp. 170
Author(s):  
Thanh-Son Dao ◽  
Le-Thanh-Tuyen Tran ◽  
Thi-My-Chi Vo ◽  
Ba-Trung Bui
Keyword(s):  
Inductively Coupled Plasma ◽  
Life History Traits ◽  
Daphnia Lumholtzi ◽  
Inductively Coupled ◽  
Ecological Protection ◽  
Icp Ms ◽  
Guideline Values ◽  
Realistic Assessment ◽  
Median Lethal Concentrations ◽  
Plasma Mass Spectrometry

<p class="emsd-body"><span lang="EN-GB">In this study we evaluated the responses of the tropical micro-crustacean, <em>Daphnia lumholtzi</em>, to zinc (Zn). For a more environmentally realistic assessment on the Zn toxicity, water sample collected from Saigon River was used as medium for the daphnids and Zn was spiked into field water for exposures. River water was physically and chemically measured and analyzed, and the sufficient water quality was confirmed prior to be used for the acute and chronic experiments. Metal concentrations in the test water were determined with an inductively coupled plasma/ mass spectrometry (ICP/MS). In the acute test implementation, Zn concentrations were from 67 – 360 µg/L. In the chronic experiments, the animals were incubated in control (filtered field water only) or filtered field water added with Zn (28, 46, and 75 µg/L) over the period of 14 days. The life history traits of daphnids including the survival, maturation, reproduction were daily observed. The results showed that the value of median lethal concentrations (48h-LC<sub>50</sub>) was 136 µg Zn/L (95% CI = 107 – 165 µg Zn/L). Chronic exposures revealed that Zn caused the survival reduction, delayed maturity age and reproduction decrease. Our study suggested <em>D. lumholtzi</em> as a very good freshwater aquatic zooplankton for assessment on the toxicity of metals in tropics. Besides, the Vietnam guideline values regarding Zn should be re-considered and adjusted for the aquatic ecological protection.</span></p>

scholarly journals Concentrations of Trace Elements in Bottled Water Consumed in Angono, Philippines

2020 ◽  
Vol 54 (5) ◽  
Author(s):  
Seiji Maruyama ◽  
Hisaaki Kato ◽  
Takafumi Hirata ◽  
Noel R. Juban
Keyword(s):  
Trace Elements ◽  
Inductively Coupled Plasma ◽  
The Philippines ◽  
Bottled Water ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Guideline Value ◽  
Guideline Values ◽  
Plasma Mass Spectrometry ◽  
Who Guideline

Introduction. We analyzed the concentrations of the trace elements [chromium (Cr), arsenic (As), cadmium (Cd),cesium (Cs), lead (Pb), thorium (Th), and uranium (U)] in commercial bottled water consumed in the town of Angono,Rizal province, Luzon island, Philippines to evaluate the health risks of the trace elements in drinking water. Thereare some arguments that water resources available in the Philippines are heavily polluted by various materials, inparticular heavy metal elements. Method. The concentrations of seven trace elements in commercial bottled water produced and consumed in thePhilippines were analyzed using a solution nebulization inductively coupled plasma mass spectrometry (SN−ICP−MS). Result. The concentrations of the trace elements except for Cs, which does not yet have a WHO guideline value,in the locally produced bottled water were below the WHO guideline values. The Cs concentrations (<0.6 μg/L) ofthe bottled water of the Philippines were generally similar to those of the bottled water produced and consumed inother countries such as Japan, China, and Indonesia. Conclusion. The concentrations of trace elements in bottled water consumed in Angono, Philippines can be regardedas being at safe levels, as well as those of daily life water (i.e. tap, well, and spring water) consumed in the said town.

Single Particle Inductively Coupled Plasma Mass Spectrometry: Investigating Nonlinear Response Observed in Pulse Counting Mode and Extending the Linear Dynamic Range by Compensating for Dead Time Related Count Losses on a Microsecond Timescale

2019 ◽  
Author(s):  
Ingo Strenge ◽  
Carsten Engelhard
Keyword(s):  
Mass Spectrometry ◽  
Inductively Coupled Plasma ◽  
Nonlinear Response ◽  
Dynamic Range ◽  
Dead Time ◽  
Inorganic Nanoparticles ◽  
Linear Dynamic Range ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry

<p>The article demonstrates the importance of using a suitable approach to compensate for dead time relate count losses (a certain measurement artefact) whenever short, but potentially strong transient signals are to be analysed using inductively coupled plasma mass spectrometry (ICP-MS). Findings strongly support the theory that inadequate time resolution, and therefore insufficient compensation for these count losses, is one of the main reasons for size underestimation observed when analysing inorganic nanoparticles using ICP-MS, a topic still controversially discussed.</p>

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