Soil pH values were measured using a pH-meter (ST3100, Ohaus Instruments, NJ, USA) at a ratio of 1:5 (mass/volume), after shaking equilibration for approximately 30 min. The determination of the total nitrogen (TN) and total organic carbon (TOC) were conducted according to standard procedures [29 (link)]. The soil total phosphorus (TP) was determined using ultraviolet spectrophotometry with the molybdate ascorbic acid method [30 ]. To determine the content of the soil trace (e.g., Cs, Pb, Cd, Ni, Cr, As, Hg, Be, Ho, Lu, Tm, W, Y, Rb, Sr, and Ba) and major elements (e.g., K, Ca, Fe, and Mg), 0.2 g of the soil samples were digested with 2 mL HCl, 8 mL HNO3, and 0.25 mL H2O2 at approximately 140 °C, 165 °C, and 190 °C for 10 min each, followed by 210 °C and 225 °C for 20 min each. The soil trace element (e.g., Cs, Be, Tm, and Lu) contents were measured using ICP-MS (NexION 350, PerkinElmer Instruments, Waltham, MA, USA), and the major element (e.g., K, Ca, Fe, and Mg) contents were measured using atomic absorption spectrometry (AAS-6800, Shimadzu, Kyoto, Japan).
Aas 6800
Manufactured by Shimadzu
Sourced in Japan
The AAS-6800 is an atomic absorption spectrometer manufactured by Shimadzu. It is a laboratory instrument used for the determination of the concentration of specific elements in a sample through the analysis of the absorption of light by the sample.
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Lab products found in correlation
6 protocols using aas 6800
1
Comprehensive Soil Elemental Analysis
2
Determination of Heavy Metals via AAS
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The atomic absorption spectrophotometer AAS 6800 (Shimadzu) with deuterium background correction was used for all metal analysis. The analysis of Cd, Ni and Pb was performed by GFAAS attached with an autosampler ASC-6100. Argon gas was used for flushing the furnace. The standards, blank and sample solutions were analyzed for the elements of interest utilizing with suitable hollow cathode lamps. The lamp current flow (mA) were 8 (Cd), 12 (Ni) and 10 (Pb). The wavelengths (λmax) used for this analysis were 228.8 nm for Cd, 232.0 nm for Ni and 283.3 nm for Pb, respectively. The percentages of different elements in the samples were determined by the corresponding standard calibration curves.
3
Trace Element Analysis by AAS
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An atomic absorption spectrophotometer (AAS-6800 Shimadzu, Koyoto, Japan) coupled with flame atomic absorption spectrometry (FAAS), GFA-EX7 graphite furnace atomizer (GFA), and ASC-6100 auto sampler (Shimadzu, Koyoto, Japan) utilized for trace element analyses. A high-density graphite tube used for atomization of trace elements and. hollow cathode lamps used for irradiation. FAAS with employed with air/acetylene (10/1.5) and nitrous oxide acetylene flams for the determination of Mo with the burner position adjusted for maximum sensitivity.
4
Atomic Absorption Spectroscopy for Metal Analysis
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The metal concentration in the digests was determined by atomic absorption spectrophotometry (Shimadzu, model AAS-6800, Japan) equipped with Zeeman background correction and graphite furnace at the National Research Institute for Chemical Technology, Zaria. The calibration curve was prepared by running different concentrations of the standard solutions.
5
Determination of As(III) in Groundwater by CE-C4D
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As(III) in groundwater samples was determined by CE-C 4 D using the standard addition method (3 points) with the average analysis time for each sample of 45 min. The nal sample solution contained 20 mM of Arg and 1.8 mM of 1,10-phenanthroline. The optimized BGE for As(III) analysis was 12 mM MES/ 21 mM Arg/30 mM CTAB (pH 8.9). Samples were electrokinetically injected at À6 kV for 60 s and separated at À20 kV in a capillary of 60 cm total length. The C 4 D detector was situated at an effective length of 52 cm. For cross-checking purpose, arsenic was determined with a Shimadzu AAS 6800 instrument using a hydride vaporization generator (HVG) according to the standard method detailed in ref. 53.
6
Annual Water Quality Monitoring Protocol
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, SO 4 2À , K + , NH 4 + , Mg 2+ , Ca 2+ and Na + in an annual water quality control campaign. Water samples were collected at 20 cm below the surface, pre-ltered with 2 mm paper lters (for lakes containing much algae and having a deep green color) and nally ltered with 0.45 mm membrane lters (Sartorius, Göttingen, Germany). The surface water and groundwater samples were also transported to the lab and stored at 4 C for subsequent in-lab analysis and cross-checked with the standard methods. The cations i.e. earth alkali and alkali metals were analyzed by F-AAS or F-AES on a Shimadzu AAS 6800 instrument. Anions were analyzed by IC using a Shimadzu LC20AD/HIC-20ASuper instrument. Ammonium was determined spectro-photometrically using nitroprusside whereas phosphate was analyzed by the molybdenum blue method using a Shimadzu UV 3101 equipment. More details on analytical procedures can be found in ref. 1 and3.
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