Figures (5)  Tables (2)

    • Figure 1. 

      Structures of five target water-insoluble pesticides: chlorfenapyr, cypermethrin, fenpropathrin, hexaconazole, and λ-cyhalothrin.

    • Figure 2. 

      The field dissipation curves of chlorfenapyr, cypermethrin, fenpropathrin, hexaconazole, and λ-cyhalothrin on the jasmine buds.

    • Figure 3. 

      Relationships between field dissipation, transfer during scenting, and physico-chemical parameters of chlorfenapyr, cypermethrin, fenpropathrin, hexaconazole, and λ-cyhalothrin: (a) Correlation matrix heatmap, where x1–9 refer to log Mw, log Vp, log H, log Ws, log Kow, log Koc, log Mp, log t1/2, and log TR, respectively. (b) Linear regression between log t1/2 and log Ws.

    • Figure 4. 

      The violin plot of chlorfenapyr, cypermethrin, fenpropathrin, and λ-cyhalothrin residues in 24 real jasmine tea, with the median value plotted. Hexaconazole was not detected out.

    • Figure 5. 

      Risk assessment of chlorfenapyr, cypermethrin, fenpropathrin, and λ-cyhalothrin in jasmine tea between 17 clusters of countries in GEMS: (a) G01–G17, and (b) three groups of people: children, women, and general.

    • Matrix Pesticides Fortified at 0.01 mg/kg (0.005 mg/L) Fortified at 0.1 mg/kg (0.01 mg/L) Fortified at 1 mg/kg (0.05 mg/L) R2 LOQ
      (mg/kg or mg/L)
      Recovery (%) RSD (%) Recovery (%) RSD (%) Recovery (%) RSD (%)
      Jasmine Chlorfenapyr 93 3 80 1 88 6 0.9996 0.01
      Flowers Cypermethrin 109 16 76 16 99 5 0.9983 0.01
      Fenpropathrin 110 3 78 7 97 5 0.9999 0.01
      Hexaconazole 85 6 92 3 104 3 0.9990 0.01
      λ-cyhalothrin 111 9 77 7 98 5 0.9986 0.01
      Tea Chlorfenapyr 87 16 83 10 93 5 0.9982 0.01
      Cypermethrin 81 16 90 19 98 8 0.9918 0.01
      Fenpropathrin 96 10 94 10 107 12 0.9947 0.01
      Hexaconazole 97 14 75 3 95 13 0.9982 0.01
      λ-cyhalothrin 88 19 113 6 102 10 0.9919 0.01
      Tea Chlorfenapyr 100 4 87 10 99 4 0.9995 0.005
      Infusion Cypermethrin 95 6 95 9 89 3 0.9908 0.005
      Fenpropathrin 97 5 115 15 93 5 0.9988 0.005
      Hexaconazole 101 2 90 4 103 2 0.9987 0.005
      λ-cyhalothrin 90 6 94 18 85 4 0.9900 0.005

      Table 1. 

      The fortified level, average recovery, RSD, correlation coefficient of linear equation, and LOQ of chlorfenapyr, cypermethrin, fenpropathrin, hexaconazole, and λ-cyhalothrin in jasmine flowers, tea, and tea infusion (n = 5).

    • Pesticide Round of
      scenting      		 Residue (mg/kg) Weight ratio
      of tea to
      jasmine buds      		 TR (%)
      Jasmine buds Tea
      Chlorfenapyr 1st 0.75 0.064 1.5 5.7
      2nd 0.59 0.12 1.2 7.9
      3rd 0.47 0.17 1 10.6
      Total 7.4
      Cypermethrin 1st 0.43 0.021 1.5 3.3
      2nd 0.37 0.034 1.2 2.9
      3rd 0.39 0.062 1 7.2
      Total 4.2
      Fenpropathrin 1st 0.79 0.079 1.5 6.7
      2nd 0.68 0.12 1.2 5.0
      3rd 0.62 0.20 1 12.9
      Total 7.6
      Hexaconazole 1st 0.55 0.057 1.5 6.9
      2nd 0.41 0.085 1.2 5.7
      3rd 0.35 0.11 1 7.1
      Total 6.6
      λ-cyhalothrin 1st 0.070 0.011 1.5 10.5
      2nd 0.063 0.020 1.2 11.9
      3rd 0.069 0.025 1 7.2
      Total 10.0

      Table 2. 

      TRs of chlorfenapyr, cypermethrin, fenpropathrin, hexaconazole, and λ-cyhalothrin from jasmine buds to tea during three scentings.