{'fraction_non_alphanumeric': 0.02714440825190011, 'fraction_numerical': 0.019543973941368076, 'mean_word_length': 5.492957746478873, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Analysis of organophosphate pesticides in surface water—Comparison of method optimization approaches

A multiresidue method optimization was conducted using the design of experiment approach. Out of 43 tested organophosphate compounds, 27 could be validated in surface water, yielding limits of detection of 0.6 to 2.5 ng L −1 by dispersive liquid‐liquid micro‐extraction and subsequent liquid chromatography‐tandem quadrupole mass spectrometry (LC‐MSMS) detection. For the optimization of the sample preparation, the factors sonication time, sample volume, binary extraction ratio, and addition of salt have been investigated by the Taguchi design of experiment approach. One hundred fifty milliliters sample were extracted for 1 minute with 400  μ L acetone and 800  μ L tetrachloroethene (TCE) three times subsequently. No salts were added. Combined extracts were reconstituted in 65  μ L methanol, ready for analysis.