Bonaijer has launched a new type of large volume water treatment column, which is an extension of traditional solid-phase extraction disks. The special column tube shape design, combined with automated instruments, can achieve high-speed and effective enrichment of bulk water samples; The unique design of LDC allows the sample bottle to be directly inverted onto the top of the column, making sampling convenient; The sample sampling speed is fast, not easily clogged, and suitable for the collection and processing of large volume samples in the environment; Low background, high sensitivity, strong universality, suitable for enrichment analysis of various polar and non-polar samples;