ISO 12846-2012 pdf download.Water quality – Determination of mercury一Method using atomic absorption spectrometry (AAS) with and without enrichment. ISO 12846 specifies two methods for the determination of mercury in drinking, surface, ground. rain and waste water after appropriate pre-digestion. For the first method (described in Clause 6), an enrichment step by amalgamation of the Hg on, for example, a gold/platinum adsorber is used. For the method given in Clause 7, the enrichment step is omitted. The choice of method depends on the equipment available, the matrix and the concentration range of interest. Both methods are suitable for the determination of mercury in water. The method with enrichment (see Clause 6) commonly has a practical working range from 0.01 pg/I to 1 pgll. The mean limit of quantification (LOQ) reported by the participants of the validation trial (see Annex A) was 0,008 pg!l. This information on the LOO gives the user of this International Standard an orientation and does not replace the estimation of performance data based on laboratoryspecifIc data. It has to be considered that it is possible to achieve lower LOOs with specific instrumentation (e.g. single mercury analysers). The method without enrichment (in Clause 7) commonly has a practical…

ISO 14403-1-2012 pdf free download.Water quality – Determination of total cyanide and free cyanide using flow analysis (FlA and CFA)—Part 1:Method using flow injection analysis (FIA). This part of lSO 14403 specifies methods for the determination of cyanide in various types of water (suchas ground, drinking, surface, leachate, and waste water) with cyanide concentrations from 2 ugl to 500 uglexpressed as cyanide ions in the undiluted sample. The range of application can be changed by varying theoperation conditions, e.g. by diluting the original sample or using a different injection volume. ln this part of lSO 14403, a suitable mass concentration range from 20 ug/l to 200 ug/l is described. Seawater can be analysed with possible changes in sensitivity and adaptation of the reagent and calibrationsolutions to the salinity of the samples. 2Normative references The following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited applies.For undated references, the latest edition of the referenced document(including any amendments) applies. ISO 3696, Water for analytical and laboratory use— Specification and test methods ISO 5667-3, Water quality — Sampling —Part 3: Preservation and handling of water samples IS0 8466-1,Water quality — Calibration and evaluation of analytical methods…

ISO 5814-2012 pdf free download.Water quality – Determination of dissolved oxygen – Electrochemical probe method. ISO 5814 specifies an electrochemical method for the determination of dissolved oxygen in water by means of an electrochemical cell which is isolated from the sample by a gas permeable membrane. Measurement can be made either as a concentration of oxygen in milligrams per litre, percentage saturation (% dissolved oxygen) or both. The method measures oxygen in water corresponding to 1 % to 100 % saturation. However, most instruments permit measurement of values higher than 100 %, i.e. supersaturation. NOTE Supersaturation is possible when the partial pressure of oxygen is higher than in air. Especially when strong algal growth is present, supersaturation of up to 200 % and above can occur. The method measures oxygen in water with a saturation higher than 100 %, when special arrangements to prevent the outgassing of oxygen during the handling and measurement of the sample are made. The method is suitable for measurements made in the field and for continuous monitoring of dissolved oxygen, as well as measurements made in the laboratory. It is the preferred method for highly coloured and turbid waters, and also for analysis of waters…

BS EN ISO 10704:2019 pdf free.Water quality – Gross alpha and gross beta activity- Test method using thin source deposit. Gross alpha and gross beta activity can be measured using either a silicon surface barrier (SSB) detector or a proportional counter (windowless). Ion-implanted Si detectors and window-proportional counters (between 80 pg cm-2 to 400 pg cm-2) may also be used. Gross alpha and gross beta activity can also be counted using a silver-activated zinc sulfide scintillation screen and plastic scintillation detector, respectively. 6 Sampling Sample, handle and store water samples in accordance with ISO 56ZJ. and IS56623. Additional information on sampling of different types of waters can be found in the relative parts of the ISO 5667 series[9lLWl11[I2IlUJlI4JI11L1l. The laboratory sample is not usually acidified as the test portion is directly evaporated on the planchet. Acidification minimizes the loss of radioactive material from solution by adsorption on the wall of the vial, but is done after filtration, as otherwise it desorbs radioactive material already adsorbed on the particulate material and, also, increases the salt content of the test sample, and thus the thickness of the deposit. If necessary, concentrated nitric acid can be used (it is recommended to avoid hydrochloric…