A Comparative Study on the Analysis Methods for Chlorophyll-a

2013 ◽  
Vol 726-731 ◽  
pp. 1411-1415 ◽  
Author(s):  
Fei Peng ◽  
Shi Bo Liu ◽  
Hai Yan Xu ◽  
Zhi Qun Li
Keyword(s):  
Detection Limit ◽  
Chlorophyll A ◽  
Water Samples ◽  
Chlorophyll A Fluorescence ◽  
Standard Procedure ◽  
Fluorescence Method ◽  
Monitoring Method ◽  
Detection Range ◽  
Analysis Methods

This paper investigated three chlorophyll-a analysis methods in water sample. The UV-VIS spectrophotometry method followed SL88-2012 standard procedure, the results showed the detection limit of chlorophyll-a was 0.22 μg/L, with the lower detection limit of 1.0 μg/L. The detection range of the vivo chlorophyll-a fluorescence method was 0.1-300μg/L, the ratios of different algae matched that prepared in water samples. The detection limits and quantification limits for HPLC by using UVD and FLD were respectively 0.013 and 0.004 μg/L, 0.040 and 0.013μg/L. FLD was more sensitive than UVD for chlorophyll-a analysis, and the recovery of standard addition was in the range of 90.2% to 103.9% with UVD and FLD. Given the different pretreatment procedures of the sample, equipment conditions, correction and precision, vivo chlorophyll-a fluorescence method was the best on-site monitoring and the emergency monitoring method. Spectrophotometer was suitable for routine laboratory determination of chlorophyll-a, especially for bulk water samples. HPLC method had high precision and sensitivity, so this method applied to the determination of exact requirements, microanalysis and pigment separation.

A Hydride Generation-Nanosilver Surface Plasmon Resonance Absorption Spectral Method for the Determination of Trace Se(IV)

2013 ◽  
Vol 749 ◽  
pp. 491-494
Author(s):  
Ai Hui Liang ◽  
Qing Ye Liu ◽  
Gui Qing Wen ◽  
Ting Sheng Li ◽  
Zhi Liang Jiang
Keyword(s):  
Surface Plasmon Resonance ◽  
Detection Limit ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Water Samples ◽  
Hydride Generation ◽  
Resonance Absorption ◽  
Surface Plasmon Resonance Absorption ◽  
Hcl Solution

In HCl solution, the Se (IV) was reduced to SeH2 by NaBH4, and absorbed by solution of ethanol-AgNO3. The Ag+ was reduced to nanosilver that exhibited surface plasmon resonance absorption (SPR) peaks at 292 nm and 420 nm. Under the selected conditions, the value at 292 nm was linear to the concentration of Se (IV) in the range of 0.08-2.0 μg/mL, a detection limit of 0.04 μg/mL. The proposed method was applied to detect Se (IV) in water samples, with satisfactory results.

Analysis of Tri-aryl Phosphate Esters and the Determination of Imol S-140 in Fish Tissue and Water Samples by Gas Chromatography

1975 ◽  
Vol 32 (4) ◽  
pp. 457-460 ◽  
Author(s):  
Derek A. J. Murray
Keyword(s):  
Gas Chromatography ◽  
Detection Limit ◽  
Water Samples ◽  
Fish Tissue ◽  
Phosphate Esters ◽  
Lower Detection Limit ◽  
Lower Detection ◽  
Trimethylsilyl Derivatives ◽  
The Individual

This report describes a method for the analysis of tri-aryl phosphate esters used commercially as lubricants. In a fish toxicity study, Imol S-140 (tri-tolyl phosphate) was extracted from fish tissue and water samples, hydrolyzed, and the individual phenols measured by gas chromatography as the trimethylsilyl derivatives. The lower detection limit was about 3 ppm of Imol in wet fish tissue.

Label-Free Aptamer Fluorescence Determination of Trace Pb2+ Using AuPd Nanoalloy Probe as Catalyst

2013 ◽  
Vol 631-632 ◽  
pp. 18-21 ◽  
Author(s):  
Zhi Liang Jiang ◽  
Mei Ling Tang ◽  
Qing Ye Liu ◽  
Ai Hui Liang
Keyword(s):  
Detection Limit ◽  
Fluorescence Quenching ◽  
Fluorescence Intensity ◽  
Water Samples ◽  
Catalytic Effect ◽  
Rhodamine 6G ◽  
Label Free ◽  
Double Stranded Dna ◽  
Fluorescence Determination

In the condition of 1.24 mmol/L EDTANa2, 16.7 mmol/L NaCl and 0.17 mmol/L Tris, the substrate chain of double-stranded DNA (dsDNA) could be cracked by Pb2+ to release single-stranded DNA (ssDNA) that adsorb onto AuPd nanoparticle (AuPdNP) and form stable AuPdNP-ssDNA, but the dsDNA can not protect AuPdNP that were aggregated to big AuPdNP aggregations (AuPdNPA) under the action of NaCl. The AuPdNP-ssDNA and AuPdNPA could be separated by centrifugation. With the concentration of Pb2+ increased, the released ssDNA increased, the AuPdNP-ssDNA in centrifugation solution increased and the catalytic effect enhanced on the fluorescence quenching reaction of Rhodamine 6G (Rh6G) and NaH2PO2, which led the fluorescence intensity at 552nm to decrease. The decreased fluorescence intensity (ΔF552nm) was linear to the concentration of Pb2+ in the range of 0.33-8.00 nmol/L, a detection limit of 0.21 nmol/L. The proposed method was applied to detect Pb2+ in water samples, with satisfactory results.

scholarly journals MOFs-Derived Nano-CuO Modified Electrode as a Sensor for Determination of Hydrazine Hydrate in Aqueous Medium

Sensors ◽  
2019 ◽  
Vol 20 (1) ◽  
pp. 140 ◽  
Author(s):  
Yaqi Lu ◽  
Dan Wu ◽  
Ziyin Li ◽  
Quanjie Lin ◽  
Xiuling Ma ◽  
...  
Keyword(s):  
Detection Limit ◽  
Hydrazine Hydrate ◽  
Aqueous Medium ◽  
Water Samples ◽  
Electrocatalytic Activity ◽  
Rapid Determination ◽  
High Toxicity ◽  
Sem Images ◽  
Nano Structure

It very important to be able to efficiently detect hydrazine hydrate in an aqueous medium due to its high toxicity. Here, we have proposed a new idea: to construct a sensor for the rapid determination of hydrazine hydrate based on the nano-CuO derived by controlled pyrolysis of HKUST-1 [Cu3(BTC)2(H2O)3]. The as-prepared CuO at 400 °C possesses a uniform appearance with nano-structure via SEM images, and the nano-CuO-400 has exhibited excellent electrocatalytic activity towards hydrazine oxidation. Amperometric i-t curves shows the peak current as linearly proportional to the hydrazine concentration within 1.98–169.3 μmol L−1 and 232–2096 μmol L−1 with the detection limit of 2.55 × 10−8 mol L−1 and 7.01 × 10−8 mol L−1, respectively. Moreover, the sensor constructed in the experiment shows good selectivities, and it is feasible to determining actual water samples.

Synthesis of 1-(4-Antipyrine)-3-(Sulfanilic Acid)-Triazene and Study on Determination of Zinc(II) in Water Samples by Spectrophotometry

2011 ◽  
Vol 347-353 ◽  
pp. 1431-1435
Author(s):  
Ping Hua Zhu ◽  
Wen Bin Chen
Keyword(s):  
Detection Limit ◽  
Water Samples ◽  
Reaction System ◽  
Tween 80 ◽  
Sulfanilic Acid ◽  
Molar Ratio ◽  
Stable Complex ◽  
Colour Reaction ◽  
Aas Method

The synthesis of a new triazene reagent 1-(4-antipyrine)-3-(sulfanilic acid)-triazene (ASTA) and is proposed as a new sensitive reagent for the extractive spectrophotometric determination of Zinc(II) was established. The results showed that in the presence of micromulsion Tween-80, ASTA could reacted with Zn ( Ⅱ) to form a red stable complex of which the molar ratio of reagent︰metal was 2︰1 in Na2B4O7-NaOH medium. The maximum absorption peak of the complex was located at 520 nm with the apparent molar absorption of 1.7×105 L•mol-1•cm-1. Beers law was obeyed in the range of 0.3～5.0 μg/10 mL for Zn (Ⅱ) and the detection limit was 0.11 mg/L. Many ions did not interfere the colour reaction system due to the existence of ammonia. This method was applied to determination of Zn (Ⅱ) in water samples, and the results were in accordance with those obtained by AAS method. Recovery was in the range of 96.5～101.5 % and the RSD(n=6) was not more than 1.4%.

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