Gas/Diffusion Flow Injection Determination of Ammonium Ions in River and Waste Waters by Conductometry

1999 ◽  
Vol 64 (12) ◽  
pp. 1966-1974 ◽  
Author(s):  
Jiří Vlček ◽  
Vlastimil Kubáň
Keyword(s):  
Detection Limit ◽  
Flow Rate ◽  
Gas Diffusion ◽  
Waste Waters ◽  
Ammonium Ions ◽  
Diffusion Flow ◽  
Conductometric Method ◽  
Good Detection Limit ◽  
Good Detection

An FIA conductometric method for monitoring of ammonium ions in river and waste waters is proposed. A very good detection limit (xD 5.6 μmol l-1) was obtained at 100/20 s preconcentration/rinsing times and 2 ml sample consumption per analysis at the flow rate 0.8 ml min-1. The detection limit xD can be further improved at longer preconcentration/ rinsing times. Precipitation of polyvalent metal ions (mainly Fe(III)) was eliminated by addition of 0.5 mmol l-1 EDTA prior to injection. The results are comparable with those obtained by spectrophotometry (Nessler's reagent).

Gas Diffusion-Flow Injection Determination of Free and Total Sulfur Dioxide in Wines by Conductometry

1998 ◽  
Vol 63 (6) ◽  
pp. 770-782 ◽  
Author(s):  
Petr Kubáň ◽  
Pavel Janoš ◽  
Vlastimil Kubáň
Keyword(s):  
Sulfuric Acid ◽  
Detection Limit ◽  
Sulfur Dioxide ◽  
Flow Injection ◽  
Gas Diffusion ◽  
Total Sulfur ◽  
Diffusion Flow ◽  
Pvdf Membrane ◽  
Relative Standard

Sensitive flow injection analysis methods for the determination of free and total sulfur dioxide in wines are presented. The bound S(IV) was liberated by alkaline hydrolysis with 4 mol/l NaOH. All forms of S(IV) were liberated from the sample zone by sulfuric acid and subsequently transported through a microporous PVDF membrane. The penetrated gases were collected in water for preselected period and determined by conductometry with detection limit 1 mg/l and relative standard deviations 0.8 and 0.6% at 10 and 150 mg/l (n = 10) for free and total S(IV), respectively. The results are comparable with those obtained by standard titrimetric procedures with visual (Czech State Standard) and/or potentiometric indication.

A fluorogenic and chromogenic dual sensor for the detection of cyanide and copper(ii) in water samples and living cells

2016 ◽  
Vol 8 (38) ◽  
pp. 6909-6915 ◽  
Author(s):  
T. M. Ebaston ◽  
G. Balamurugan ◽  
S. Velmathi
Keyword(s):  
Charge Transfer ◽  
Detection Limit ◽  
Fluorescent Sensor ◽  
Aqueous Media ◽  
Living Cells ◽  
Dual Sensor ◽  
Molecular Charge ◽  
Intra Molecular Charge Transfer ◽  
Good Detection Limit ◽  
Good Detection

Here we describe a simple fluorescent sensor based on intra molecular charge transfer to detect cyanide in aqueous media selectively with a very good detection limit and cascade recognition of aq. copper(ii) ions.

A Sensitive Formaldehyde Sensor Based on Cataluminescence Coupled with Thermal Desorption

2014 ◽  
Vol 670-671 ◽  
pp. 1163-1166 ◽  
Author(s):  
Hong Wei Yang ◽  
Zheng Xing ◽  
Kao Wen Zhou
Keyword(s):  
Detection Limit ◽  
Thermal Desorption ◽  
Flow Rate ◽  
Active Carbon ◽  
Room Temperature ◽  
High Selectivity ◽  
Formaldehyde In Air ◽  
Benzene Toluene ◽  
Versus Concentration

A sensitive cataluminescence-based detecting technology using nanosized Mo4V6Ti10O47 as a probe was proposed for determination of formaldehyde in air. Trace formaldehyde was firstly absorbed on active carbon at room temperature to concentrate, then desorbed at 75°C to determine. The method showed high selectivity to formaldehyde at wavelength of 575nm, satisfying activity at temperature of 260°C and good stability at carrier flow rate of 145 ml/min. The linear range of CTL intensity versus concentration of formaldehyde was 0.04~78 mg/m3, and the detection limit (3σ) was 0.02 mg/m3. The recovery of artificial sample was 96.8%-103.4% by this method. There was no response to CO, CO2, SO2, NH3, methanol, ethanol, benzene, toluene and xylenes.

Sensitive and ultra-fast determination of arsenic(III) by gas-diffusion flow injection analysis with chemiluminescence detection

2007 ◽  
Vol 583 (1) ◽  
pp. 72-77 ◽  
Author(s):  
Cristina Lomonte ◽  
Matthew Currell ◽  
Richard J.S. Morrison ◽  
Ian D. McKelvie ◽  
Spas D. Kolev
Keyword(s):  
Flow Injection ◽  
Flow Injection Analysis ◽  
Gas Diffusion ◽  
Chemiluminescence Detection ◽  
Diffusion Flow ◽  
Fast Determination

A Novel Ammonia Sensor Utilizing Cataluminescence on Nano-TiW3Cr2O14

2011 ◽  
Vol 694 ◽  
pp. 184-188 ◽  
Author(s):  
Kao Wen Zhou ◽  
Zi Qiao Zhang ◽  
Li Jing Xing ◽  
Xin Li ◽  
Chun Xue Fu
Keyword(s):  
Detection Limit ◽  
Flow Rate ◽  
Active Carbon ◽  
Room Temperature ◽  
High Selectivity ◽  
Direct Determination ◽  
Ammonia Sensor ◽  
On Line ◽  
Versus Concentration

A new sensor based on cataluminescence (CTL) produced on the surface of nanosized TiW3Cr2O14 was demonstrated for direct determination of ammonia in air. Trace ammonia was firstly absorbed on active carbon at room temperature to concentrate, then desorbed at 105°C to determine. The sensor showed high selectivity to ammonia at wavelength of 540 nm, satisfying activity at temperature of 275°C and good stability at air carrier flow rate of 115 ml/min. The linear range of CTL intensity versus concentration of ammonia was 1.0~50 mg/m3 (γ=0.9990), and the detection limit (3σ) was 0.5 mg/m3. The recovery of artificial sample was 97.45%—102.73% by this method. There was no response to benzene, SO2, CO and formaldehyde, and insignificant response to ethanol. This gas sensor allows on-line monitoring of ammonia in air.

A Rapid and Sensitive Ether Sensor Utilizing Thermal Desorption Coupled with Cataluminescence

2013 ◽  
Vol 641-642 ◽  
pp. 238-241 ◽  
Author(s):  
Zhi Gang Cui ◽  
Shao Tong Zhang ◽  
Jin Zhao ◽  
Kao Wen Zhou
Keyword(s):  
Detection Limit ◽  
Gas Sensor ◽  
Thermal Desorption ◽  
Flow Rate ◽  
Active Carbon ◽  
Room Temperature ◽  
High Selectivity ◽  
Direct Determination ◽  
Versus Concentration

A rapid and sensitive cataluminescence (CTL)-based gas sensor using nanosized Y2Zr1.5O6 as a probe was proposed for direct determination of ether in air. Trace ether was firstly absorbed on active carbon at room temperature to concentrate, then desorbed at 65°C to determine. The sensor showed high selectivity to ether at wavelength of 510nm, satisfying activity at temperature of 310°C and good stability at carrier flow rate of 110 ml/min. The linear range of CTL intensity versus concentration of ether was 2~100 mg/m3, and the detection limit (3σ) was 1.1 mg/m3. The recovery of artificial sample was 95.4%—106.7% by this method. The response to formaldehyde, benzene, NH3 and ethanol was insignificant, and there was no response to SO2, CO and acetone. The technique is a convenient and fast way of determining ether in air.

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