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Precipitation Gravimetry01:03

Precipitation Gravimetry

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Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
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In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
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Ice cloud backscatter study and comparison with CALIPSO and MODIS satellite data.

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    This study refines ice cloud models using the invariant imbedding T-matrix method. It characterizes ice clouds as a mix of smooth and rough particles, improving satellite data accuracy.

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    Area of Science:

    • Atmospheric Science
    • Cloud Physics
    • Remote Sensing

    Background:

    • Accurate representation of ice cloud radiative properties is crucial for climate modeling.
    • Existing satellite products like MODIS Collection 6 require refinement in ice cloud backscattering properties.
    • Understanding ice crystal morphology impacts cloud radiative transfer simulations.

    Purpose of the Study:

    • To calculate single-scattering properties of aggregate ice crystals using the invariant imbedding T-matrix (II-TM) method.
    • To refine the backscattering properties of ice clouds within the MODIS Collection 6 cloud optical property product.
    • To characterize the non-uniform zonal distribution of ice clouds over oceans.

    Main Methods:

    • Utilized the invariant imbedding T-matrix (II-TM) method for single-scattering calculations of 8-column aggregate ice crystals.
    • Compared II-TM backscatter values with the improved geometric-optics method (IGOM).
    • Derived the integrated attenuated backscatter-to-cloud optical depth (IAB-ICOD) relation using a CALIPSO lidar simulator and Monte Carlo radiative transfer model.

    Main Results:

    • II-TM based backscatter values were obtained and compared with IGOM.
    • The IAB-ICOD relation was derived from simulations.
    • Ice clouds over oceans were characterized as a mixture of smooth (approx. 6-9%) and rough ice particles by comparing simulations with CALIPSO and MODIS observations.

    Conclusions:

    • The study provides refined backscattering properties for ice clouds, crucial for improving satellite-based cloud optical property products.
    • Characterization of ice clouds as a mixture of smooth and rough particles enhances the understanding of their radiative impact.
    • This research contributes to more accurate climate modeling and remote sensing data interpretation.