Which is the best method for the measurement of Fluoride in water samples?

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How to prepare samples for plotting a calibration curve for SPADNS test for fluorides in UV Spectrophotometer?

I am trying to plot a calibration curve for the measurement of fluoride in water samples using SPADNS method in UV Spectrophotometer. I have done several trials and could not get a proper curve....

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Any resources for understanding the Shishkin Mesh and the HODIE scheme?

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• What the possible Persistent Organic Pollutants and Heavy metals present in fluorspar, sediments, and water bodies around its mining area?

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Which type of compound does lamda max of 218 indicate in a uv-vis spectrum of a partially purified compound through column and TLC?

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Baseline drift in HPLC? What causes this?

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What is the reason for current dropping in OER , LSV curve?

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Handling Missing Data and Building a Predictive Model with Incomplete Information ?

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Do interactions between biosphere, carbon cycle, & water cycle impact global warming & interaction between atmosphere & hydrosphere?

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Is it true that $\det(V(A))$ may be only $\pm 1$, depending on $n$, for the last symmetric tridiagonal matrix $A$?

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How to calculate CCS for Sodiated adduct ions and Multiply Charged Ions?

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RNA later for the preservation of RNA in fecal samples at room temperature for one day (37°C)?

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If we are using snowball sampling technique, how do we justify the true representativeness of the sample statistically? is there any statistical test?

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Pheiroijam Herojit Singh

Fluoride can be determined by potentiometric (ISE), colorimetric (SPADNS) and Gas chromatographic(GC) methods. However colorimetric method is time consuming and not used in biological media such as blood and urine. ISE method is most frequently used method for fluoride measurement in biological media. It utilizes a membrane consisting of a slice of single crystal of lanthanum fluoride doped with europium(II). SPADNS method is used in UV Spectrophotometer.

Virendra Kumar Saxena

For fluoride measurement selective ion method is widely used. However Spectropho tometric/colorimeter are also useful

Tyler Hurst

Fluoride ion can also be detected by Ion Chromatography. It works great for water samples and inorganic applications. It also requires little to no sample preparation.