Overview
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Key numbers
The worker extracted the full PDF text with layout preservation twice and compared extraction hashes before commit. The following lines are copied from numeric/table-bearing regions of the PDF and retain the source units and wording where legible:
- RPD values below 10 % and the recovery values falling within the range of 90 – 110 %.
- It means that the reaction of hexavalent chromium complex with 1,5-diphenyl carbazide
- The chromogenic reagent usually used in the dichromate, phosphoric acid, sulfuric acid, 0.5 % 1,5-
- Figure 1. UV Visible Spectrophotometer %RPD value was utilized as a control for accuracy in
- Sample Cr6+ (10 mg/L) as much as 2.0, 5.0, 10.0,
- flask. Then poured as much as 2 mL of 0.5 % spike measurements were also performed to assess the
- Hasanela, 2022). It means that the concentration and
- The addition of acid to the solution serves to acceptable value for R2, which is 0.995. It means that
- produced also increases. Table 1 below shows the for each time interval. There were no significant
- Table 1 shows that higher Cr(VI) concentrations minute time interval, and the measurement of Cr(VI)
- Table 2. Sample measurement result This study is carried out as a duplicate to
- Time interval (Minutes) calculate RPD value (Table 4). The value is used to
- Table 4. The RPD value
- Table 3. ANOVA calculation B 90 0.7357
- Within Table 5. Spike measurement
- Based on Table 3, hypothesis evaluation can be
- calculated F value with the F table, and secondly, by requirements specified in SNI 6989-71: 2009, where
- error. Firstly, if the calculated F value is bigger than between 90 % to 110 %. This result indicated accurate
- smaller than the F table, which is 4.387374. It means study shows that there is no significant difference
- (95%) is smaller than 0.05, Ho will be rejected, and variation range of measurement. This proves that
- vice versa. Based on Table 3, the p-value is bigger when analysis is performed within the maximum time
- than 0.05, so Ho is accepted. Hypothesis evaluation in range of 180 minutes, the obtained results are still
- in the hexavalent chromium analysis. below 10 % and the recovery values falling within the
Methods (brief)
- spectrophotometer in terms of time. The sample was measured in 540 nm of wavelength
- Hachair & Hofmann, 2018). Sometimes, the samples
- chromium in a sample. The UV Visible
- waiting for sample queues. This condition causes
- samples to change in color before analysis, making
- involves passing light through the sample and
- sample absorbs specific wavelengths of light
- the absorption spectrum of the sample with reference
- chromium hexavalent analysis in a sample using the
- making reagents, sample preparation, calibration times replications.
- curves, sample analysis, calculation, and data
- Sample Cr6+ (10 mg/L) as much as 2.0, 5.0, 10.0,
- add some distilled water until ¾ part of the volumetric In addition to measuring standards and samples,
- water and make it homogenous. known concentration standard samples to the analysis
- (%R: recovery (%), A: spike sample concentration
- Preparation of calibration curve (mg/L), B: sample concentration (mg/L), C: added
- Sample concentration is determined using Equation 1 One-way ANOVA is used in the statistical
- (y: absorbance value, b: Slope, x: sample calculation. This statistical technique involves
Implications
This page makes the source discoverable for category-level evidence routing. Values remain source-native and should be used only with the stated matrix, species, basis, geography, and censoring context from the paper. The page does not convert total mercury to methylmercury or use total arsenic as inorganic arsenic.
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Verification notes
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pdftotext -layoutwas run on the full PDF twice; extracted text hashes matched before the page was written. - Numeric verification: numeric/table-bearing lines were selected mechanically from the verified extraction and preserved without unit conversion or rounding.
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Update history
The five most recent substantive edits to this page, classified major (evidence or structure moved), correction (a published value or statement was wrong and has been fixed), or minor (narrative rewritten without changing the underlying evidence). Each description is derived from what the edit did to this page; the linked commit is the authoritative record, routine regeneration passes are excluded, and the full version history lives in git. When DOI minting comes online (see schema docs), each entry below will also link to a version-pinned DataCite DOI.