Continuous intermittent sampling device for determining different forms of elements

Abstract

The invention relates to the field of element form detection and provides a continuous intermittent sampling device for determining different forms of an element. The device comprises a controller, aregulating valve and a pump; the inlet of the pump is connected with a pipeline used for conveying a mobile phase; the controller controls the regulating valve to regulate a flow direction of pumped liquid as well as flow directions, separated by a separator, of different forms; a first end of the regulating valve is connected with the separator, a second end of the regulating valve is connected with the outlet of the pump, and a third end of the regulating valve is connected with a detector; and the controller controls the regulating valve to regulate according to peak appearance times of different forms of the element, so as to regulate on-off of a pipeline between the detector as well as the separator and the pump. The continuous intermittent sampling device provided by the invention controls the flow directions of the forms of the element by controlling the direction of the regulating valve, only a target form flows into the detector, and the mobile phase flows into the detector asa supplement, so that a baseline signal is avoided from seriously drifting, and accurate determination performed on a certain low-content form when multiple high-content and low-content forms of theelement coexist is realized.

Description

technical field [0001] The invention relates to the technical field of element form detection, in particular to a continuous intermittent sampling device for measuring different forms of elements. Background technique [0002] The forms of elements are divided into physical forms and chemical forms. In general, elemental forms generally refer to chemical forms. The chemical form of an element refers to the actual form in which an element exists in a certain ion or molecule, which includes the valence state, compound state, inorganic state and organic state, combined state and structural state of the element. According to the definition of the International Union of Theoretical and Applied Chemistry (IUPAC), "chemical speciation analysis refers to the process of determining the atomic and molecular composition of the analyzed substance", which refers to the various forms of existence of elements, including free states, covalently bound states, and complex complexes. Qualitat...

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Problems solved by technology

[0003] The embodiment of the present invention provides a continuous discontinuous sampling device for determining different forms of elements, which is used to solve the problem that in the existing combined technology of element speciation analysis, all forms of the same element enter the detector due to continuous sampling, so that Species with high content interfere with the detection of trace species, resulting in inaccurate or even undeterminable trace species measurement

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